10-Q

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C.  20549

FORM 10-Q

QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d)

OF THE SECURITIES EXCHANGE ACT OF 1934

For the quarterly period ended:  September 30, 2019

Commission File Number:  000-29274

AEI INCOME & GROWTH FUND XXI LIMITED PARTNERSHIP

(Exact name of registrant as specified in its charter)

State of Minnesota	41-1789725
(State or other jurisdiction of incorporation or organization)	(I.R.S. Employer Identification No.)
30 East 7th Street, Suite 1300 St. Paul, Minnesota 55101	(651) 227-7333
(Address of principal executive offices)	(Registrant’s telephone number)

Not Applicable

(Former name, former address and former fiscal year, if changed since last report)

Indicate by check mark whether the registrant (1) has filed all reports required to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during the preceding 12 months (or for such shorter period that the registrant was required to file such reports), and (2) has been subject to such filing requirements for the past 90 days.     ⌧ Yes    □ No

Indicate by check mark whether the registrant has submitted electronically and posted on its corporate Web site, if any, every Interactive Data File required to be submitted and posted pursuant to Rule 405 of Regulation S-T (§232.405 of this chapter) during the preceding 12 months (or for such shorter period that the registrant was required to submit and post such files).     ⌧ Yes    □ No

Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer, or a smaller reporting company.  See the definitions of “large accelerated filer,” “accelerated filer” and “smaller reporting company” in Rule 12b-2 of the Exchange Act.

□ Large accelerated filer	□ Accelerated filer
□ Non-accelerated filer	⌧ Smaller reporting company
□ Emerging growth company

If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act.     □

Indicate by check mark whether the registrant is a shell company (as defined in Rule 12b-2 of the Exchange Act).     □ Yes    ⌧ No

AEI INCOME & GROWTH FUND XXI LIMITED PARTNERSHIP

INDEX

				Page
Part I – Financial Information
	Item 1.	Financial Statements:
		Balance Sheets as of September 30, 2019 and December 31, 2018		3
		Statements for the Periods ended September 30, 2019 and 2018:
			Income	4
			Cash Flows	5
			Changes in Partners’ Capital (Deficit)	6
		Notes to Financial Statements		7 - 10
	Item 2.	Management's Discussion and Analysis of Financial
			Condition and Results of Operations	11 - 16
	Item 3.	Quantitative and Qualitative Disclosures About Market Risk		16
	Item 4.	Controls and Procedures		16
Part II – Other Information
	Item 1.	Legal Proceedings		16
	Item 1A.	Risk Factors		16
	Item 2.	Unregistered Sales of Equity Securities and Use of Proceeds		17
	Item 3.	Defaults Upon Senior Securities		17
	Item 4.	Mine Safety Disclosures		17
	Item 5.	Other Information		17
	Item 6.	Exhibits		17
Signatures				18

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AEI INCOME & GROWTH FUND XXI LIMITED PARTNERSHIP

BALANCE SHEETS

ASSETS

	September 30,			December 31,
	2019			2018
	(unaudited)
Current Assets:
Cash	$	829,804		$	993,307
Receivables		1,466			3,664
Total Current Assets		831,270			996,971
Real Estate Investments:
Land		2,959,461			3,659,461
Buildings		8,932,356			10,339,539
Acquired Intangible Lease Assets		621,258			807,178
Real Estate Held for Investment, at cost		12,513,075			14,806,178
Accumulated Depreciation and Amortization		(4,157,139	)		(4,239,689	)
Real Estate Held for Investment, Net		8,355,936			10,566,489
Real Estate Held for Sale		1,925,710			0
Total Real Estate Investments		10,281,646			10,566,489
Total Assets	$	11,112,916		$	11,563,460

LIABILITIES AND PARTNERS' CAPITAL

Current Liabilities:
Payable to AEI Fund Management, Inc.	$	102,025		$	107,167
Distributions Payable		198,178			198,186
Total Current Liabilities		300,203			305,353
Long-term Liabilities:
Acquired Below-Market Lease Intangibles, Net		51,350			87,655
Partners’ Capital :
General Partners		(1,093	)		2,998
Limited Partners – 24,000 Units authorized;    19,264 and 19,329 Units issued and outstanding    as of 9/30/2019 and 12/31/2018		10,762,456			11,167,454
Total Partners' Capital		10,761,363			11,170,452
Total Liabilities and Partners' Capital	$	11,112,916		$	11,563,460

The accompanying Notes to Financial Statements are an integral part of these statements.

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AEI INCOME & GROWTH FUND XXI LIMITED PARTNERSHIP

STATEMENTS OF INCOME

(unaudited)

	Three Months Ended September 30				Nine Months Ended September 30
	2019		2018		2019		2018
Rental Income	$	259,213	$	259,212	$	777,638	$	777,389
Expenses:
Partnership Administration – Affiliates		42,893		38,925		116,781		111,021
Partnership Administration and Property    Management – Unrelated Parties		22,456		18,614		83,639		84,356
Depreciation and Amortization		117,621		117,621		352,863		352,863
Total Expenses		182,970		175,160		553,283		548,240
Operating Income		76,243		84,052		224,355		229,149
Other Income:
Interest Income		3,051		2,351		9,635		4,724
Net Income	$	79,294	$	86,403	$	233,990	$	233,873
Net Income Allocated:
General Partners	$	793	$	864	$	2,340	$	2,339
Limited Partners		78,501		85,539		231,650		231,534
Total	$	79,294	$	86,403	$	233,990	$	233,873
Net Income per Limited Partnership Unit	$	4.08	$	4.41	$	12.01	$	11.89
Weighted Average Units Outstanding –       Basic and Diluted		19,264		19,402		19,286		19,473

The accompanying Notes to Financial Statements are an integral part of these statements.

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AEI INCOME & GROWTH FUND XXI LIMITED PARTNERSHIP

STATEMENTS OF CASH FLOWS

(unaudited)

	Nine Months Ended September 30
	2019			2018
Cash Flows from Operating Activities:
Net Income	$	233,990		$	233,873
Adjustments to Reconcile Net Income To Net Cash Provided by Operating Activities:
Depreciation and Amortization		338,538			338,538
(Increase) Decrease in Receivables		2,198			47,153
Increase (Decrease) in Payable to    AEI Fund Management, Inc.		(5,142	)		67,971
Total Adjustments		335,594			453,662
Net Cash Provided By (Used For)    Operating Activities		569,584			687,535
Cash Flows from Investing Activities:
Investments in Real Estate		(90,000	)		0
Cash Flows from Financing Activities:
Distributions Paid to Partners		(594,550	)		(1,614,745	)
Repurchase of Partnership Units		(48,537	)		(188,845	)
Net Cash Provided By (Used For)    Financing Activities		(643,087	)		(1,803,590	)
Net Increase (Decrease) in Cash		(163,503	)		(1,116,055	)
Cash, beginning of period		993,307			2,142,394
Cash, end of period	$	829,804		$	1,026,339

The accompanying Notes to Financial Statements are an integral part of these statements.

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AEI INCOME & GROWTH FUND XXI LIMITED PARTNERSHIP

STATEMENTS OF CHANGES IN PARTNERS' CAPITAL (DEFICIT)

(unaudited)

	General Partners			Limited Partners			Total			Limited Partnership Units Outstanding
Balance, December 31, 2017	$	10,072		$	11,867,738		$	11,877,810			19,615.64
Distributions Declared		(1,982	)		(196,198	)		(198,180	)
Net Income		762			75,427			76,189
Balance, March 31, 2018		8,852			11,746,967			11,755,819			19,615.64
Distributions Declared		(1,982	)		(196,199	)		(198,181	)
Repurchase of Partnership Units		(1,888	)		(186,957	)		(188,845	)		(213.34	)
Net Income		713			70,568			71,281
Balance, June 30, 2018		5,695			11,434,379			11,440,074			19,402.30
Distributions Declared		(1,982	)		(196,199	)		(198,181	)
Net Income		864			85,539			86,403
Balance, September 30, 2018	$	4,577		$	11,323,719		$	11,328,296			19,402.30
Balance, December 31, 2018	$	2,998		$	11,167,454		$	11,170,452			19,328.64
Distributions Declared		(1,982	)		(196,204	)		(198,186	)
Net Income		819			81,036			81,855
Balance, March 31, 2019		1,835			11,052,286			11,054,121			19,328.64
Distributions Declared		(1,982	)		(196,196	)		(198,178	)
Repurchase of Partnership Units		(486	)		(48,051	)		(48,537	)		(64.66	)
Net Income		728			72,113			72,841
Balance, June 30, 2019		95			10,880,152			10,880,247			19,263.98
Distributions Declared		(1,981	)		(196,197	)		(198,178	)
Net Income		793			78,501			79,294
Balance, September 30, 2019	$	(1,093	)	$	10,762,456		$	10,761,363			19,263.98

The accompanying Notes to Financial Statements are an integral part of these statements.

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AEI INCOME & GROWTH FUND XXI LIMITED PARTNERSHIP

NOTES TO FINANCIAL STATEMENTS

SEPTEMBER 30, 2019

(unaudited)

(1)  The condensed statements included herein have been prepared by the registrant, without audit, pursuant to the rules and regulations of the Securities and Exchange Commission, and reflect all adjustments which are, in the opinion of management, necessary to a fair statement of the results of operations for the interim period, on a basis consistent with the annual audited statements.  The adjustments made to these condensed statements consist only of normal recurring adjustments.  Certain information, accounting policies, and footnote disclosures normally included in financial statements prepared in accordance with United States Generally Accepted Accounting Principles (US GAAP) have been condensed or omitted pursuant to such rules and regulations, although the registrant believes that the disclosures are adequate to make the information presented not misleading.  It is suggested that these condensed financial statements be read in conjunction with the financial statements and the summary of significant accounting policies and notes thereto included in the registrant’s latest annual report on Form 10‑K.

(2)  Organization –

AEI Income & Growth Fund XXI Limited Partnership (“Partnership”) was formed to acquire and lease commercial properties to operating tenants.  The Partnership's operations are managed by AEI Fund Management XXI, Inc. (“AFM”), the Managing General Partner.  Robert P. Johnson, the President and sole director of AFM, serves as the Individual General Partner.  AFM is a wholly owned subsidiary of AEI Capital Corporation of which Mr. Johnson is the majority shareholder.  AEI Fund Management, Inc. (“AEI”), an affiliate of AFM, performs the administrative and operating functions for the Partnership.

The terms of the Partnership offering called for a subscription price of $1,000 per Limited Partnership Unit, payable on acceptance of the offer.  The Partnership commenced operations on April 14, 1995 when minimum subscriptions of 1,500 Limited Partnership Units ($1,500,000) were accepted.  On January 31, 1997, the offering terminated when the maximum subscription limit of 24,000 Limited Partnership Units was reached.  Under the terms of the Limited Partnership Agreement, the Limited Partners and General Partners contributed funds of $24,000,000 and $1,000, respectively.

During operations, any Net Cash Flow, as defined, which the General Partners determine to distribute will be distributed 90% to the Limited Partners and 10% to the General Partners; provided, however, that such distributions to the General Partners will be subordinated to the Limited Partners first receiving an annual, noncumulative distribution of Net Cash Flow equal to 10% of their Adjusted Capital Contribution, as defined, and, provided further, that in no event will the General Partners receive less than 1% of such Net Cash Flow per annum.  Distributions to Limited Partners will be made pro rata by Units.

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AEI INCOME & GROWTH FUND XXI LIMITED PARTNERSHIP

NOTES TO FINANCIAL STATEMENTS

(2)  Organization – (Continued)

Any Net Proceeds of Sale, as defined, from the sale or financing of properties which the General Partners determine to distribute will, after provisions for debts and reserves, be paid in the following manner: (i) first, 99% to the Limited Partners and 1% to the General Partners until the Limited Partners receive an amount equal to: (a) their Adjusted Capital Contribution plus (b) an amount equal to 10% of their Adjusted Capital Contribution per annum, cumulative but not compounded, to the extent not previously distributed from Net Cash Flow;  (ii) any remaining balance will be distributed 90% to the Limited Partners and 10% to the General Partners.  Distributions to the Limited Partners will be made pro rata by Units.

For tax purposes, profits from operations, other than profits attributable to the sale, exchange, financing, refinancing or other disposition of property, will be allocated first in the same ratio in which, and to the extent, Net Cash Flow is distributed to the Partners for such year.  Any additional profits will be allocated in the same ratio as the last dollar of Net Cash Flow is distributed.  Net losses from operations will be allocated 99% to the Limited Partners and 1% to the General Partners.

For tax purposes, profits arising from the sale, financing, or other disposition of property will be allocated in accordance with the Partnership Agreement as follows: (i) first, to those partners with deficit balances in their capital accounts in an amount equal to the sum of such deficit balances; (ii) second, 99% to the Limited Partners and 1% to the General Partners until the aggregate balance in the Limited Partners' capital accounts equals the sum of the Limited Partners' Adjusted Capital Contributions plus an amount equal to 10% of their Adjusted Capital Contributions per annum, cumulative but not compounded, to the extent not previously allocated; (iii) third, the balance of any remaining gain will then be allocated 90% to the Limited Partners and 10% to the General Partners.  Losses will be allocated 98% to the Limited Partners and 2% to the General Partners.

The General Partners are not required to currently fund a deficit capital balance.  Upon liquidation of the Partnership or withdrawal by a General Partner, the General Partners will contribute to the Partnership an amount equal to the lesser of the deficit balances in their capital accounts or 1% of total Limited Partners' and General Partners' capital contributions.

In January 2014, the Managing General Partner mailed a Consent Statement (Proxy) seeking the consent of the Limited Partners to continue the Partnership for an additional 60 months or to initiate the final disposition, liquidation and distribution of all of the Partnership’s properties and assets.  On February 14, 2014, the proposal to continue the Partnership was approved with a majority of Units voted in favor of the continuation proposal.  As a result, the Managing General Partner will continue the operations of the Partnership for an additional 60 months at which time it intends to again ask the Limited Partners to vote on the same two proposals.

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AEI INCOME & GROWTH FUND XXI LIMITED PARTNERSHIP

NOTES TO FINANCIAL STATEMENTS

(3)  Recently Adopted Accounting Pronouncements –

In August 2018, the SEC adopted the final rule under SEC Release No. 33-10532, Disclosure Update and Simplification, amending certain disclosure requirements that were redundant, duplicative, overlapping, outdated or superseded.  In addition, the amendments expanded the disclosure requirements for the analysis of partners’ capital for interim financial statements.  Under the amendments, an analysis of changes in each caption of partners’ capital presented in the balance sheet must be provided in a note or separate statement.  The analysis should present a reconciliation of the beginning balance to the ending balance of each period for which a statement of income is required to be filed.  The Partnership’s first presentation of year-to-date quarterly changes in partners’ capital was included in its Form 10‑Q for the quarter ended March 31, 2019.

In February 2016, the Financial Accounting Standards Board (FASB) issued Accounting Standards Update (ASU) 2016-02, which provides guidance for accounting for leases.  The new guidance requires companies to recognize the assets and liabilities for the rights and obligations created by leased assets, initially measured at the present value of the lease payments.  The accounting guidance for lessors is largely unchanged.  The ASU is effective for annual and interim periods beginning after December 15, 2018. It is to be adopted using a modified retrospective approach.  The Partnership has adopted the accounting pronouncement effective January 1, 2019 and the adoption of the standard did not have a material impact on the Partnership’s financial statements.

(4)  Real Estate Investments –

The Partnership owns a 30% interest in the Gander Mountain store in Champaign, Illinois.  The remaining interests in the property are owned by affiliates of the Partnership.  On March 10, 2017, Gander Mountain Company filed for Chapter 11 reorganization and announced it was closing the store, following a liquidation sale of its on‑site assets.  In June 2017, the tenant filed a motion with the bankruptcy court to reject the lease for this store effective June 30, 2017.  At this time, the tenant returned possession of the property to the owners and the Partnership became responsible for its 30% share of real estate taxes and other costs associated with maintaining the property.  The tenant paid rent through June 2017.  The owners have listed the property for lease with a real estate broker in the Champaign area.

In March 2019, the Partnership entered into an agreement with the tenant of the Jared Jewelry store in Auburn Hills, Michigan to extend the lease term five years to end on December 31, 2024.  As part of the agreement, the annual rent will decrease from $124,049 to $105,560 effective January 1, 2020.

In September 2019, the Partnership entered into an agreement with the tenant of the Tractor Supply Company store in Canton, Georgia to extend the lease term ten years to end on September 30, 2034.  The annual rent remained the same with a 3.0% increase scheduled to occur after five years.  As part of the agreement, the Partnership paid a tenant improvement allowance of $90,000 that was capitalized.

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AEI INCOME & GROWTH FUND XXI LIMITED PARTNERSHIP

NOTES TO FINANCIAL STATEMENTS

(4)  Real Estate Investments – (Continued)

In September 2019, the Partnership entered into an agreement to sell its 50% interest in the Tractor Supply Company store to an unrelated third party.  On October 23, 2019, the sale closed with the Partnership receiving net proceeds of approximately $2,739,000, which resulted in a net gain of approximately $813,300.  At the time of sale, the cost and related accumulated depreciation and amortization was $2,302,500 and $376,790, respectively.  At September 30, 2019, the property was classified as Real Estate Held for Sale with a carrying value of $1,925,710.

(5)  Payable to AEI Fund Management, Inc. –

AEI Fund Management, Inc. performs the administrative and operating functions for the Partnership.  The payable to AEI Fund Management represents the balance due for those services.  This balance is non-interest bearing and unsecured and is to be paid in the normal course of business.

(6)  Partners’ Capital –

For the nine months ended September 30, 2019 and 2018, the Partnership declared distributions of $594,542 for both years.  The Limited Partners received distributions of $588,597 and $588,596 and the General Partners received distributions of $5,945 and $5,946 for the periods, respectively.  The Limited Partners' distributions represented $30.52 and $30.23 per Limited Partnership Unit outstanding using 19,286 and 19,473 weighted average Units in 2019 and 2018, respectively.  The distributions represented $9.52 and $2.25 per Unit of Net Income and $21.00 and $27.98 per Unit of contributed capital in 2019 and 2018, respectively.

As part of the distributions discussed above, the Partnership distributed net sale proceeds of $64,513 and $197,980 in 2019 and 2018, respectively.  The Limited Partners received distributions of $63,868 and $196,000 and the General Partners received distributions of $645 and $1,980 for the periods, respectively.  The Limited Partners’ distributions represented $3.32 and $10.10 per Unit for the periods, respectively.

On April 1, 2019, the Partnership repurchased a total of 64.66 Units for $48,051 from five Limited Partners in accordance with the Partnership Agreement.  On April 1, 2018, the Partnership repurchased a total of 213.34 Units for $186,957 from eight Limited Partners. The Partnership acquired these Units using Net Cash Flow from operations.  The repurchases increase the remaining Limited Partners' ownership interest in the Partnership.  As a result of these repurchases and pursuant to the Partnership Agreement, the General Partners received distributions of $486 and $1,888 in 2019 and 2018, respectively.

(7)  Fair Value Measurements –

As of September 30, 2019 and December 31, 2018, the Partnership had no assets or liabilities measured at fair value on a recurring basis or nonrecurring basis.

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ITEM 2.  MANAGEMENT'S DISCUSSION AND ANALYSIS OF FINANCIAL

CONDITION AND RESULTS OF OPERATIONS.

This section contains "forward-looking statements" which represent management's expectations or beliefs concerning future events, including statements regarding anticipated application of cash, expected returns from rental income, growth in revenue, the sufficiency of cash to meet operating expenses, rates of distribution, and other matters.  These, and other forward-looking statements, should be evaluated in the context of a number of factors that may affect the Partnership's financial condition and results of operations, including the following:

— Market and economic conditions which affect the value of the properties the Partnership owns and the cash from rental income such properties generate;

— the federal income tax consequences of rental income, deductions, gain on sales and other items and the effects of these consequences for the Partners;

— resolution by the General Partners of conflicts with which they may be confronted;

— the success of the General Partners of locating properties with favorable risk return characteristics;

— the effect of tenant defaults; and

— the condition of the industries in which the tenants of properties owned by the Partnership operate.

Application of Critical Accounting Policies

The Partnership’s financial statements have been prepared in accordance with US GAAP.  Preparing the financial statements requires management to use judgment in the application of these accounting policies, including making estimates and assumptions.  These judgments will affect the reported amounts of the Partnership’s assets and liabilities and the disclosure of contingent assets and liabilities as of the dates of the financial statements and will affect the reported amounts of revenue and expenses during the reporting periods.  It is possible that the carrying amount of the Partnership’s assets and liabilities, or the results of reported operations, will be affected if management’s estimates or assumptions prove inaccurate.

Management of the Partnership evaluates the following accounting estimates on an ongoing basis, and has discussed the development and selection of these estimates and the management discussion and analysis disclosures regarding them with the managing partner of the Partnership.

Allocation of Purchase Price of Acquired Properties

Upon acquisition of real properties, the Partnership records them in the financial statements at cost.  The purchase price is allocated to tangible assets, consisting of land and building, and to identified intangible assets and liabilities, which may include the value of above market and below market leases and the value of in-place leases.  The allocation of the purchase price is based upon the fair value of each component of the property.  Although independent appraisals may be used to assist in the determination of fair value, in many cases these values will be based upon management’s assessment of each property, the selling prices of comparable properties and the discounted value of cash flows from the asset.

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ITEM 2.  MANAGEMENT'S DISCUSSION AND ANALYSIS.  (Continued)

The fair values of above market and below market in-place leases will be recorded based on the present value (using an interest rate which reflects the risks associated with the leases acquired) of the difference between (i) the contractual amounts to be paid pursuant to the in-place leases and (ii) an estimate of fair market lease rates for the corresponding in-place leases measured over a period equal to the non-cancelable term of the lease including any bargain renewal periods.  The above market and below market lease values will be capitalized as intangible lease assets or liabilities.  Above market lease values will be amortized as an adjustment of rental income over the remaining term of the respective leases.  Below market lease values will be amortized as an adjustment of rental income over the remaining term of the respective leases, including any bargain renewal periods.  If a lease were to be terminated prior to its stated expiration, all unamortized amounts of above market and below market in-place lease values relating to that lease would be recorded as an adjustment to rental income.

The fair values of in-place leases will include estimated direct costs associated with obtaining a new tenant, and opportunity costs associated with lost rentals which are avoided by acquiring an in-place lease.  Direct costs associated with obtaining a new tenant may include commissions, tenant improvements, and other direct costs and are estimated, in part, by management’s consideration of current market costs to execute a similar lease.  These direct costs will be included in intangible lease assets on the balance sheet and will be amortized to expense over the remaining term of the respective leases.  The value of opportunity costs will be calculated using the contractual amounts to be paid pursuant to the in-place leases over a market absorption period for a similar lease.  These intangibles will be included in intangible lease assets on the balance sheet and will be amortized to expense over the remaining term of the respective leases.  If a lease were to be terminated prior to its stated expiration, all unamortized amounts of in-place lease assets relating to that lease would be expensed.

The determination of the fair values of the assets and liabilities acquired will require the use of significant assumptions with regard to the current market rental rates, rental growth rates, discount and capitalization rates, interest rates and other variables.  If management’s estimates or assumptions prove inaccurate, the result would be an inaccurate allocation of purchase price, which could impact the amount of reported net income.

Carrying Value of Properties

Properties are carried at original cost, less accumulated depreciation and amortization.  The Partnership tests long-lived assets for recoverability when events or changes in circumstances indicate that the carrying value may not be recoverable.  For properties the Partnership will hold and operate, management determines whether impairment has occurred by comparing the property’s probability-weighted future undiscounted cash flows to its current carrying value.  For properties held for sale, management determines whether impairment has occurred by comparing the property’s estimated fair value less cost to sell to its current carrying value.  If the carrying value is greater than the net realizable value, an impairment loss is recorded to reduce the carrying value of the property to its net realizable value.  Changes in these assumptions or analysis may cause material changes in the carrying value of the properties.

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ITEM 2.  MANAGEMENT'S DISCUSSION AND ANALYSIS.  (Continued)

Allocation of Expenses

AEI Fund Management, Inc. allocates expenses to each of the funds they manage primarily on the basis of the number of hours devoted by their employees to each fund’s affairs.  They also allocate expenses at the end of each month that are not directly related to a fund’s operations based upon the number of investors in the fund and the fund’s capitalization relative to other funds they manage.  The Partnership reimburses these expenses subject to detailed limitations contained in the Partnership Agreement.

Results of Operations

For the nine months ended September 30, 2019 and 2018, the Partnership recognized rental income of $777,638 and $777,389, respectively.  In 2019, rental income increased due to a rent increase on one property.  Based on the scheduled rent for the properties owned as of October 31, 2019, the Partnership expects to recognize rental income of approximately $1,001,000 and $835,000 in 2019 and 2020, respectively.

For the nine months ended September 30, 2019 and 2018, the Partnership incurred Partnership administration expenses from affiliated parties of $116,781 and $111,021, respectively.  These administration expenses include costs associated with the management of the properties, processing distributions, reporting requirements and communicating with the Limited Partners.  During the same periods, the Partnership incurred Partnership administration and property management expenses from unrelated parties of $83,639 and $84,356, respectively.  These expenses represent direct payments to third parties for legal and filing fees, direct administrative costs, outside audit costs, taxes, insurance and other property costs.

The Partnership owns a 30% interest in the Gander Mountain store in Champaign, Illinois.  The remaining interests in the property are owned by affiliates of the Partnership.  On March 10, 2017, Gander Mountain Company filed for Chapter 11 reorganization and announced it was closing the store, following a liquidation sale of its on‑site assets.  In June 2017, the tenant filed a motion with the bankruptcy court to reject the lease for this store effective June 30, 2017.  At this time, the tenant returned possession of the property to the owners and the Partnership became responsible for its 30% share of real estate taxes and other costs associated with maintaining the property.  The tenant paid rent through June 2017.  The owners have listed the property for lease with a real estate broker in the Champaign area.

In March 2019, the Partnership entered into an agreement with the tenant of the Jared Jewelry store in Auburn Hills, Michigan to extend the lease term five years to end on December 31, 2024.  As part of the agreement, the annual rent will decrease from $124,049 to $105,560 effective January 1, 2020.

For the nine months ended September 30, 2019 and 2018, the Partnership recognized interest income of $9,635 and $4,724, respectively.

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ITEM 2.  MANAGEMENT'S DISCUSSION AND ANALYSIS.  (Continued)

Management believes inflation has not significantly affected income from operations.  Leases may contain rent increases, based on the increase in the Consumer Price Index over a specified period, which will result in an increase in rental income over the term of the leases.  Inflation also may cause the real estate to appreciate in value.  However, inflation and changing prices may have an adverse impact on the operating margins of the properties' tenants, which could impair their ability to pay rent and subsequently reduce the Net Cash Flow available for distributions.

Liquidity and Capital Resources

During the nine months ended September 30, 2019, the Partnership's cash balances decreased $163,503 as a result of cash paid for a tenant improvement allowance and distributions paid to the Partners and cash used to repurchase Units in excess of cash generated from operating activities.  During the nine months ended September 30, 2018, the Partnership's cash balances decreased $1,116,055 as a result of distributions paid to the Partners and cash used to repurchase Units in excess of cash generated from operating activities.

Net cash provided by operating activities decreased from $687,535 in 2018 to $569,584 in 2019 as a result of an increase in Partnership administration and property management expenses in 2019 and net timing differences in the collection of payments from the tenants and the payment of expenses, which were partially offset by an increase in total rental and interest income in 2019.

The major components of the Partnership's cash flow from investing activities are investments in real estate and proceeds from the sale of real estate.  During the nine months ended September 30, 2019, the Partnership expended $90,000 to invest in real properties.

In September 2019, the Partnership entered into an agreement with the tenant of the Tractor Supply Company store in Canton, Georgia to extend the lease term ten years to end on September 30, 2034.  The annual rent remained the same with a 3.0% increase scheduled to occur after five years.  As part of the agreement, the Partnership paid a tenant improvement allowance of $90,000 that was capitalized.

In September 2019, the Partnership entered into an agreement to sell its 50% interest in the Tractor Supply Company store to an unrelated third party.  On October 23, 2019, the sale closed with the Partnership receiving net proceeds of approximately $2,739,000, which resulted in a net gain of approximately $813,300.  At the time of sale, the cost and related accumulated depreciation and amortization was $2,302,500 and $376,790, respectively.  At September 30, 2019, the property was classified as Real Estate Held for Sale with a carrying value of $1,925,710.

- 14 -

ITEM 2.  MANAGEMENT'S DISCUSSION AND ANALYSIS.  (Continued)

The Partnership's primary use of cash flow, other than investment in real estate, is distribution payments to Partners and cash used to repurchase Units.  The Partnership declares its regular quarterly distributions before the end of each quarter and pays the distribution in the first week after the end of each quarter.  The Partnership attempts to maintain a stable distribution rate from quarter to quarter.  The Partnership may repurchase tendered Units on April 1st and October 1st of each year subject to limitations.

For the nine months ended September 30, 2019 and 2018, the Partnership declared distributions of $594,542 for both years, which were distributed 99% to the Limited Partners and 1% to the General Partners.  The Limited Partners received distributions of $588,597 and $588,596 and the General Partners received distributions of $5,945 and and $5,946 for the periods, respectively.  In December 2017, the Partnership declared a special distribution of net sale proceeds of $1,010,101 which was paid in the first week of January 2018 and resulted in higher distributions paid in 2018.

As part of the distributions discussed above, the Partnership distributed net sale proceeds of $64,513 and $197,980 in 2019 and 2018, respectively.  The Limited Partners received distributions of $63,868 and $196,000 and the General Partners received distributions of $645 and $1,980 for the periods, respectively.  The Limited Partners’ distributions represented $3.32 and $10.10 per Unit for the periods, respectively.

The Partnership may repurchase Units from Limited Partners who have tendered their Units to the Partnership.  Such Units may be acquired at a discount.  The Partnership will not be obligated to purchase in any year any number of Units that, when aggregated with all other transfers of Units that have occurred since the beginning of the same calendar year (excluding Permitted Transfers as defined in the Partnership Agreement), would exceed 5% of the total number of Units outstanding on January 1 of such year.  In no event shall the Partnership be obligated to purchase Units if, in the sole discretion of the Managing General Partner, such purchase would impair the capital or operation of the Partnership.

On April 1, 2019, the Partnership repurchased a total of 64.66 Units for $48,051 from five Limited Partners in accordance with the Partnership Agreement.  On April 1, 2018, the Partnership repurchased a total of 213.34 Units for $186,957 from eight Limited Partners. The Partnership acquired these Units using Net Cash Flow from operations.  The repurchases increase the remaining Limited Partners' ownership interest in the Partnership.  As a result of these repurchases and pursuant to the Partnership Agreement, the General Partners received distributions of $486 and $1,888 in 2019 and 2018, respectively.

The continuing rent payments from the properties, together with cash generated from property sales, should be adequate to fund continuing distributions and meet other Partnership obligations on both a short-term and long-term basis.

- 15 -

ITEM 2.  MANAGEMENT'S DISCUSSION AND ANALYSIS.  (Continued)

Off-Balance Sheet Arrangements

As of September 30, 2019 and December 31, 2018, the Partnership had no material off-balance sheet arrangements that had or are reasonably likely to have current or future effects on its financial condition, results of operations, liquidity or capital resources.

ITEM 3.  QUANTITATIVE & QUALITATIVE DISCLOSURES ABOUT MARKET RISK.

Not required for a smaller reporting company.

ITEM 4.  CONTROLS AND PROCEDURES.

(a)  Disclosure Controls and Procedures.

Under the supervision and with the participation of management, including its President and Chief Financial Officer, the Managing General Partner of the Partnership evaluated the effectiveness of the design and operation of our disclosure controls and procedures (as defined in Rule 13a-15(e) under the Securities Exchange Act of 1934 (the “Exchange Act”)).  Based upon that evaluation, the President and Chief Financial Officer of the Managing General Partner concluded that, as of the end of the period covered by this report, our disclosure controls and procedures were effective in ensuring that information required to be disclosed by us in the reports that we file or submit under the Exchange Act is recorded, processed, summarized and reported within the time periods specified in applicable rules and forms and that such information is accumulated and communicated to management, including the President and Chief Financial Officer of the Managing General Partner, in a manner that allows timely decisions regarding required disclosure.

(b)  Changes in Internal Control Over Financial Reporting.

During the most recent period covered by this report, there has been no change in our internal control over financial reporting (as defined in Rule 13a-15(f) under the Exchange Act) that has materially affected, or is reasonably likely to materially affect, our internal control over financial reporting.

PART II – OTHER INFORMATION

ITEM 1.  LEGAL PROCEEDINGS.

There are no material pending legal proceedings to which the Partnership is a party or of which the Partnership's property is subject.

ITEM 1A.  RISK FACTORS.

Not required for a smaller reporting company.

- 16 -

ITEM 2.  UNREGISTERED SALES OF EQUITY SECURITIES & USE OF PROCEEDS.

(a) None.

(b) Not applicable.

(c) Pursuant to Section 7.7 of the Partnership Agreement, as amended, each Limited Partner has the right to present Units to the Partnership for purchase by submitting notice to the Managing General Partner during January or July of each year.  The purchase price of the Units is equal to 95% of the net asset value per Unit, as of the first business day of January or July of each year, as determined by the Managing General Partner in accordance with the provisions of the Partnership Agreement.  Units tendered to the Partnership during January and July may be repurchased on April 1^st and October 1^st, respectively, of each year subject to the following limitations.  The Partnership will not be obligated to purchase in any year more than 5% of the total number of Units outstanding on January 1 of such year.  In no event shall the Partnership be obligated to purchase Units if, in the sole discretion of the Managing General Partner, such purchase would impair the capital or operation of the Partnership.  During the period covered by this report, the Partnership did not purchase any Units.

ITEM 3.  DEFAULTS UPON SENIOR SECURITIES.

None.

ITEM 4.  MINE SAFETY DISCLOSURES.

Not Applicable.

ITEM 5.  OTHER INFORMATION.

None.

ITEM 6.  EXHIBITS.

31.1 Certification of Chief Executive Officer of General Partner pursuant to Rule 15d-14(a)(17 CFR 240.15d-14(a)) and Section 302 of the Sarbanes-Oxley Act of 2002.

31.2 Certification of Chief Financial Officer of General Partner pursuant to Rule 15d-14(a)(17 CFR 240.15d-14(a)) and Section 302 of the Sarbanes-Oxley Act of 2002.

32 Certification of Chief Executive Officer and Chief Financial Officer of General Partner pursuant to Section 906 of the Sarbanes-Oxley Act of 2002.

- 17 -

SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned thereunto duly authorized.

Dated:  November 13, 2019	AEI Income & Growth Fund XXI
	Limited Partnership
	By:	AEI Fund Management XXI, Inc.
	Its:	Managing General Partner
	By:	/s/ MARNI J NYGARD
		Marni J. Nygard
		President
		(Principal Executive Officer)
	By:	/s/ PATRICK W KEENE
		Patrick W. Keene
		Chief Financial Officer
		(Principal Accounting Officer)

- 18 -

EX-31.1

Exhibit 31.1

CERTIFICATIONS

I, Marni J. Nygard, certify that:

1. I have reviewed this quarterly report on Form 10-Q of AEI Income & Growth Fund XXI Limited Partnership;

2. Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;

3. Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of operations and cash flows of the registrant as of, and for, the periods presented in this report;

4. The registrant’s other certifying officer and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the registrant and have:

a)Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared;

b)Designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;

c)Evaluated the effectiveness of the registrant’s disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and

d)Disclosed in this report any change in the registrant’s internal control over financial reporting that occurred during the registrant’s most recent fiscal quarter (the registrant’s fourth fiscal quarter in the case of an annual report) that has materially affected, or is reasonably likely to materially affect, the registrant’s internal control over financial reporting; and

5. The registrant’s other certifying officer and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrant’s auditors and the audit committee of the registrant’s board of directors (or persons performing the equivalent functions):

a)All significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the registrant’s ability to record, process, summarize and report financial information; and

b)Any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant’s internal control over financial reporting.

Date:  November 13, 2019	/s/ MARNI J NYGARD
	Marni J. Nygard, President
	AEI Fund Management XXI, Inc.
	Managing General Partner

EX-31.2

Exhibit 31.2

CERTIFICATIONS

I, Patrick W. Keene, certify that:

1. I have reviewed this quarterly report on Form 10-Q of AEI Income & Growth Fund XXI Limited Partnership;

2. Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;

3. Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of operations and cash flows of the registrant as of, and for, the periods presented in this report;

4. The registrant’s other certifying officer and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the registrant and have:

a)Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared;

b)Designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;

c)Evaluated the effectiveness of the registrant’s disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and

d)Disclosed in this report any change in the registrant’s internal control over financial reporting that occurred during the registrant’s most recent fiscal quarter (the registrant’s fourth fiscal quarter in the case of an annual report) that has materially affected, or is reasonably likely to materially affect, the registrant’s internal control over financial reporting; and

5. The registrant’s other certifying officer and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrant’s auditors and the audit committee of the registrant’s board of directors (or persons performing the equivalent functions):

a)All significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the registrant’s ability to record, process, summarize and report financial information; and

b)Any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant’s internal control over financial reporting.

Date:  November 13, 2019	/s/ PATRICK W KEENE
	Patrick W. Keene, Chief Financial Officer
	AEI Fund Management XXI, Inc.
	Managing General Partner

EX-32

Exhibit 32

CERTIFICATION PURSUANT TO

18 U.S.C. §1350,

AS ADOPTED PURSUANT TO

SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002

In connection with the Quarterly Report of AEI Income & Growth Fund XXI Limited Partnership (the “Partnership”) on Form 10-Q for the period ended September 30, 2019, as filed with the Securities and Exchange Commission on the date hereof (the “Report”), the undersigned, Marni J. Nygard, President of AEI Fund Management XXI, Inc., the Managing General Partner of the Partnership, and Patrick W. Keene, Chief Financial Officer of AEI Fund Management XXI, Inc., each certify, pursuant to 18 U.S.C. §1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, that:

1. The Report fully complies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934; and

2. The information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of the Partnership.

/s/ MARNI J NYGARD

Marni J. Nygard, President

AEI Fund Management XXI, Inc.

Managing General Partner

November 13, 2019

/s/ PATRICK W KEENE

Patrick W. Keene, Chief Financial Officer

AEI Fund Management XXI, Inc.

Managing General Partner

November 13, 2019

XML

Organization

9 Months Ended

Sep. 30, 2019

Accounting Policies [Abstract]

Organization, Consolidation, Basis of Presentation, Business Description and Accounting Policies [Text Block]

(2)  Organization –

AEI Income & Growth Fund XXI Limited Partnership (“Partnership”) was formed to acquire and lease commercial properties to operating tenants.  The Partnership's operations are managed by AEI Fund Management XXI, Inc. (“AFM”), the Managing General Partner.  Robert P. Johnson, the President and sole director of AFM, serves as the Individual General Partner.  AFM is a wholly owned subsidiary of AEI Capital Corporation of which Mr. Johnson is the majority shareholder.  AEI Fund Management, Inc. (“AEI”), an affiliate of AFM, performs the administrative and operating functions for the Partnership.

The terms of the Partnership offering called for a subscription price of $1,000 per Limited Partnership Unit, payable on acceptance of the offer.  The Partnership commenced operations on April 14, 1995 when minimum subscriptions of 1,500 Limited Partnership Units ($1,500,000) were accepted.  On January 31, 1997, the offering terminated when the maximum subscription limit of 24,000 Limited Partnership Units was reached.  Under the terms of the Limited Partnership Agreement, the Limited Partners and General Partners contributed funds of $24,000,000 and $1,000, respectively.

During operations, any Net Cash Flow, as defined, which the General Partners determine to distribute will be distributed 90% to the Limited Partners and 10% to the General Partners; provided, however, that such distributions to the General Partners will be subordinated to the Limited Partners first receiving an annual, noncumulative distribution of Net Cash Flow equal to 10% of their Adjusted Capital Contribution, as defined, and, provided further, that in no event will the General Partners receive less than 1% of such Net Cash Flow per annum.  Distributions to Limited Partners will be made pro rata by Units.

Any Net Proceeds of Sale, as defined, from the sale or financing of properties which the General Partners determine to distribute will, after provisions for debts and reserves, be paid in the following manner: (i) first, 99% to the Limited Partners and 1% to the General Partners until the Limited Partners receive an amount equal to: (a) their Adjusted Capital Contribution plus (b) an amount equal to 10% of their Adjusted Capital Contribution per annum, cumulative but not compounded, to the extent not previously distributed from Net Cash Flow;  (ii) any remaining balance will be distributed 90% to the Limited Partners and 10% to the General Partners.  Distributions to the Limited Partners will be made pro rata by Units.

For tax purposes, profits from operations, other than profits attributable to the sale, exchange, financing, refinancing or other disposition of property, will be allocated first in the same ratio in which, and to the extent, Net Cash Flow is distributed to the Partners for such year.  Any additional profits will be allocated in the same ratio as the last dollar of Net Cash Flow is distributed.  Net losses from operations will be allocated 99% to the Limited Partners and 1% to the General Partners.

For tax purposes, profits arising from the sale, financing, or other disposition of property will be allocated in accordance with the Partnership Agreement as follows: (i) first, to those partners with deficit balances in their capital accounts in an amount equal to the sum of such deficit balances; (ii) second, 99% to the Limited Partners and 1% to the General Partners until the aggregate balance in the Limited Partners' capital accounts equals the sum of the Limited Partners' Adjusted Capital Contributions plus an amount equal to 10% of their Adjusted Capital Contributions per annum, cumulative but not compounded, to the extent not previously allocated; (iii) third, the balance of any remaining gain will then be allocated 90% to the Limited Partners and 10% to the General Partners.  Losses will be allocated 98% to the Limited Partners and 2% to the General Partners.

The General Partners are not required to currently fund a deficit capital balance.  Upon liquidation of the Partnership or withdrawal by a General Partner, the General Partners will contribute to the Partnership an amount equal to the lesser of the deficit balances in their capital accounts or 1% of total Limited Partners' and General Partners' capital contributions.

In January 2014, the Managing General Partner mailed a Consent Statement (Proxy) seeking the consent of the Limited Partners to continue the Partnership for an additional 60 months or to initiate the final disposition, liquidation and distribution of all of the Partnership’s properties and assets.  On February 14, 2014, the proposal to continue the Partnership was approved with a majority of Units voted in favor of the continuation proposal.  As a result, the Managing General Partner will continue the operations of the Partnership for an additional 60 months at which time it intends to again ask the Limited Partners to vote on the same two proposals.

XML

Statement of Income - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Rental Income	$ 259,213	$ 259,212	$ 777,638	$ 777,389
Expenses:
Partnership Administration – Affiliates	42,893	38,925	116,781	111,021
Partnership Administration and Property Management – Unrelated Parties	22,456	18,614	83,639	84,356
Depreciation and Amortization	117,621	117,621	352,863	352,863
Total Expenses	182,970	175,160	553,283	548,240
Operating Income	76,243	84,052	224,355	229,149
Other Income:
Interest Income	3,051	2,351	9,635	4,724
Net Income	79,294	86,403	233,990	233,873
Net Income Allocated:
General Partners	793	864	2,340	2,339
Limited Partners	$ 78,501	$ 85,539	$ 231,650	$ 231,534
Net Income per Limited Partnership Unit (in Dollars per share)	$ 4.08	$ 4.41	$ 12.01	$ 11.89
Weighted Average Units Outstanding – Basic and Diluted (in Shares)	19,264	19,402	19,286	19,473

XML

Organization (Details) - USD ($)	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Jan. 31, 1997	Apr. 14, 1995
Limited Partner [Member]
Organization (Details) [Line Items]
Capital Units, Value										$ 1,000
Limited Partners' Capital Account, Units Outstanding (in Shares)	19,264	19,263.98	19,328.64	19,329	19,402.30	19,402.30	19,615.64	19,615.64	24,000	1,500
Limited Partners' Contributed Capital									$ 24,000,000	$ 1,500,000
General Partner [Member]
Organization (Details) [Line Items]
General Partners' Contributed Capital									$ 1,000

XML

Payable to AEI Fund Management, Inc.

9 Months Ended

Sep. 30, 2019

Payables and Accruals [Abstract]

Accounts Payable and Accrued Liabilities Disclosure [Text Block]

(5)  Payable to AEI Fund Management, Inc. –

AEI Fund Management, Inc. performs the administrative and operating functions for the Partnership.  The payable to AEI Fund Management represents the balance due for those services.  This balance is non-interest bearing and unsecured and is to be paid in the normal course of business.

XML

Accounting Policies, by Policy (Policies)	9 Months Ended
	Sep. 30, 2019
Accounting Policies [Abstract]
Distribution Policy, Members or Limited Partners, Description	During operations, any Net Cash Flow, as defined, which the General Partners determine to distribute will be distributed 90% to the Limited Partners and 10% to the General Partners; provided, however, that such distributions to the General Partners will be subordinated to the Limited Partners first receiving an annual, noncumulative distribution of Net Cash Flow equal to 10% of their Adjusted Capital Contribution, as defined, and, provided further, that in no event will the General Partners receive less than 1% of such Net Cash Flow per annum.  Distributions to Limited Partners will be made pro rata by Units.Any Net Proceeds of Sale, as defined, from the sale or financing of properties which the General Partners determine to distribute will, after provisions for debts and reserves, be paid in the following manner: (i) first, 99% to the Limited Partners and 1% to the General Partners until the Limited Partners receive an amount equal to: (a) their Adjusted Capital Contribution plus (b) an amount equal to 10% of their Adjusted Capital Contribution per annum, cumulative but not compounded, to the extent not previously distributed from Net Cash Flow;  (ii) any remaining balance will be distributed 90% to the Limited Partners and 10% to the General Partners.  Distributions to the Limited Partners will be made pro rata by Units.
Key Provisions of Operating or Partnership Agreement, Description	For tax purposes, profits from operations, other than profits attributable to the sale, exchange, financing, refinancing or other disposition of property, will be allocated first in the same ratio in which, and to the extent, Net Cash Flow is distributed to the Partners for such year.  Any additional profits will be allocated in the same ratio as the last dollar of Net Cash Flow is distributed.  Net losses from operations will be allocated 99% to the Limited Partners and 1% to the General Partners.For tax purposes, profits arising from the sale, financing, or other disposition of property will be allocated in accordance with the Partnership Agreement as follows: (i) first, to those partners with deficit balances in their capital accounts in an amount equal to the sum of such deficit balances; (ii) second, 99% to the Limited Partners and 1% to the General Partners until the aggregate balance in the Limited Partners' capital accounts equals the sum of the Limited Partners' Adjusted Capital Contributions plus an amount equal to 10% of their Adjusted Capital Contributions per annum, cumulative but not compounded, to the extent not previously allocated; (iii) third, the balance of any remaining gain will then be allocated 90% to the Limited Partners and 10% to the General Partners.  Losses will be allocated 98% to the Limited Partners and 2% to the General Partners.The General Partners are not required to currently fund a deficit capital balance.  Upon liquidation of the Partnership or withdrawal by a General Partner, the General Partners will contribute to the Partnership an amount equal to the lesser of the deficit balances in their capital accounts or 1% of total Limited Partners' and General Partners' capital contributions
New Accounting Pronouncement or Change in Accounting Principle, Description	In August 2018, the SEC adopted the final rule under SEC Release No. 33-10532, Disclosure Update and Simplification, amending certain disclosure requirements that were redundant, duplicative, overlapping, outdated or superseded. In addition, the amendments expanded the disclosure requirements for the analysis of partners’ capital for interim financial statements. Under the amendments, an analysis of changes in each caption of partners’ capital presented in the balance sheet must be provided in a note or separate statement. The analysis should present a reconciliation of the beginning balance to the ending balance of each period for which a statement of income is required to be filed. The Partnership’s first presentation of year-to-date quarterly changes in partners’ capital was included in its Form 10‑Q for the quarter ended March 31, 2019.In February 2016, the Financial Accounting Standards Board (FASB) issued Accounting Standards Update (ASU) 2016-02, which provides guidance for accounting for leases.  The new guidance requires companies to recognize the assets and liabilities for the rights and obligations created by leased assets, initially measured at the present value of the lease payments.  The accounting guidance for lessors is largely unchanged.  The ASU is effective for annual and interim periods beginning after December 15, 2018. It is to be adopted using a modified retrospective approach.  The Partnership has adopted the accounting pronouncement effective January 1, 2019 and the adoption of the standard did not have a material impact on the Partnership’s financial statements.

XML

Real Estate Investments

9 Months Ended

Sep. 30, 2019

Real Estate [Abstract]

Real Estate Disclosure [Text Block]

(4)  Real Estate Investments –

The Partnership owns a 30% interest in the Gander Mountain store in Champaign, Illinois.  The remaining interests in the property are owned by affiliates of the Partnership.  On March 10, 2017, Gander Mountain Company filed for Chapter 11 reorganization and announced it was closing the store, following a liquidation sale of its onsite assets.  In June 2017, the tenant filed a motion with the bankruptcy court to reject the lease for this store effective June 30, 2017. At this time, the tenant returned possession of the property to the owners and the Partnership became responsible for its 30% share of real estate taxes and other costs associated with maintaining the property. The tenant paid rent through June 2017.  The owners have listed the property for lease with a real estate broker in the Champaign area.

In March 2019, the Partnership entered into an agreement with the tenant of the Jared Jewelry store in Auburn Hills, Michigan to extend the lease term five years to end on December 31, 2024.  As part of the agreement, the annual rent will decrease from $124,049 to $105,560 effective January 1, 2020.

In September 2019, the Partnership entered into an agreement with the tenant of the Tractor Supply Company store in Canton, Georgia to extend the lease term ten years to end on September 30, 2034.  The annual rent remained the same with a 3.0% increase scheduled to occur after five years.  As part of the agreement, the Partnership paid a tenant improvement allowance of $90,000 that was capitalized.

In September 2019, the Partnership entered into an agreement to sell its 50% interest in the Tractor Supply Company store to an unrelated third party.  On October 23, 2019, the sale closed with the Partnership receiving net proceeds of approximately $2,739,000, which resulted in a net gain of approximately $813,300.  At the time of sale, the cost and related accumulated depreciation and amortization was $2,302,500 and $376,790, respectively.  At September 30, 2019, the property was classified as Real Estate Held for Sale with a carrying value of $1,925,710.

XML

Document And Entity Information	9 Months Ended
	Sep. 30, 2019 shares
Document Information Line Items
Entity Registrant Name	AEI Income & Growth Fund XXI LTD Partnership
Document Type	10-Q
Current Fiscal Year End Date	--12-31
Entity Common Stock, Shares Outstanding	19,264
Amendment Flag	false
Entity Central Index Key	0000931755
Entity Current Reporting Status	Yes
Entity Filer Category	Non-accelerated Filer
Document Period End Date	Sep. 30, 2019
Document Fiscal Year Focus	2019
Document Fiscal Period Focus	Q3
Entity Small Business	true
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Ex Transition Period	false
City Area Code	651
Document Quarterly Report	true
Document Transition Report	false
Entity Address, Address Line One	30 East 7th Street, Suite 1300
Entity Address, City or Town	St. Paul
Entity Address, Country	US
Entity Address, Postal Zip Code	55101
Entity File Number	000-29274
Entity Incorporation, State or Country Code	MN
Entity Interactive Data Current	Yes
Entity Tax Identification Number	41-1789725
Local Phone Number	227-7333
No Trading Symbol Flag	true
Security Exchange Name	NONE
Title of 12(g) Security	Limited Partnership Units

XML

Statement of Cash Flows - USD ($)	9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018
Cash Flows from Operating Activities:
Net Income	$ 233,990	$ 233,873
Adjustments to Reconcile Net Income To Net Cash Provided by Operating Activities:
Depreciation and Amortization	338,538	338,538
(Increase) Decrease in Receivables	2,198	47,153
Increase (Decrease) in Payable to AEI Fund Management, Inc.	(5,142)	67,971
Total Adjustments	335,594	453,662
Net Cash Provided By (Used For) Operating Activities	569,584	687,535
Cash Flows from Investing Activities:
Investments in Real Estate	(90,000)	0
Cash Flows from Financing Activities:
Distributions Paid to Partners	(594,550)	(1,614,745)
Repurchase of Partnership Units	(48,537)	(188,845)
Net Cash Provided By (Used For) Financing Activities	(643,087)	(1,803,590)
Net Increase (Decrease) in Cash	(163,503)	(1,116,055)
Cash, beginning of period	993,307	2,142,394
Cash, end of period	$ 829,804	$ 1,026,339

XML

Recently Adopted Accounting Pronouncements

9 Months Ended

Sep. 30, 2019

New Accounting Pronouncements and Changes in Accounting Principles [Abstract]

New Accounting Pronouncements and Changes in Accounting Principles [Text Block]

(3)  Recently Adopted Accounting Pronouncements –

In August 2018, the SEC adopted the final rule under SEC Release No. 33-10532, Disclosure Update and Simplification, amending certain disclosure requirements that were redundant, duplicative, overlapping, outdated or superseded. In addition, the amendments expanded the disclosure requirements for the analysis of partners’ capital for interim financial statements. Under the amendments, an analysis of changes in each caption of partners’ capital presented in the balance sheet must be provided in a note or separate statement. The analysis should present a reconciliation of the beginning balance to the ending balance of each period for which a statement of income is required to be filed. The Partnership’s first presentation of year-to-date quarterly changes in partners’ capital was included in its Form 10‑Q for the quarter ended March 31, 2019.

In February 2016, the Financial Accounting Standards Board (FASB) issued Accounting Standards Update (ASU) 2016-02, which provides guidance for accounting for leases.  The new guidance requires companies to recognize the assets and liabilities for the rights and obligations created by leased assets, initially measured at the present value of the lease payments.  The accounting guidance for lessors is largely unchanged.  The ASU is effective for annual and interim periods beginning after December 15, 2018. It is to be adopted using a modified retrospective approach.  The Partnership has adopted the accounting pronouncement effective January 1, 2019 and the adoption of the standard did not have a material impact on the Partnership’s financial statements.

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Real Estate Investments (Details) - USD ($)				12 Months Ended
	Oct. 23, 2019	Sep. 01, 2019	Mar. 01, 2019	Dec. 31, 2020	Dec. 31, 2019	Sep. 30, 2019
Jared Jewelry Auburn Hills MI
Real Estate Investments (Details) [Line Items]
AverageLeaseTerm			In March 2019, the Partnership entered into an agreement with the tenant of the Jared Jewelry store in Auburn Hills, Michigan to extend the lease term five years to end on December 31, 2024.
Revenue from Contract with Customer, Excluding Assessed Tax				$ 105,560	$ 124,049
Tractor Supply Canton GA
Real Estate Investments (Details) [Line Items]
AverageLeaseTerm		In September 2019, the Partnership entered into an agreement with the tenant of the Tractor Supply Company store in Canton, Georgia to extend the lease term ten years to end on September 30, 2034.
Payments for Tenant Improvements		$ 90,000
Disposal Date	Oct. 23, 2019
Proceeds from Sale of Real Estate	$ 2,739,000
Gain (Loss) on Disposition of Assets	813,300
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Cost of Investment in Real Estate Sold	2,302,500
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Accumulated Depreciation	$ 376,790
Property, Plant and Equipment, Gross						$ 1,925,710

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Partners' Capital

9 Months Ended

Sep. 30, 2019

Partners' Capital Notes [Abstract]

Partners' Capital Notes Disclosure [Text Block]

(6)  Partners’ Capital –

For the nine months ended September 30, 2019 and 2018, the Partnership declared distributions of $594,542 for both years.  The Limited Partners received distributions of $588,597 and $588,596 and the General Partners received distributions of $5,945 and $5,946 for the periods, respectively.  The Limited Partners' distributions represented $30.52 and $30.23 per Limited Partnership Unit outstanding using 19,286 and 19,473 weighted average Units in 2019 and 2018, respectively.  The distributions represented $9.52 and $2.25 per Unit of Net Income and $21.00 and $27.98 per Unit of contributed capital in 2019 and 2018, respectively.

As part of the distributions discussed above, the Partnership distributed net sale proceeds of $64,513 and $197,980 in 2019 and 2018, respectively.  The Limited Partners received distributions of $63,868 and $196,000 and the General Partners received distributions of $645 and $1,980 for the periods, respectively.  The Limited Partners’ distributions represented $3.32 and $10.10 per Unit for the periods, respectively.

On April 1, 2019, the Partnership repurchased a total of 64.66 Units for $48,051 from five Limited Partners in accordance with the Partnership Agreement.  On April 1, 2018, the Partnership repurchased a total of 213.34 Units for $186,957 from eight Limited Partners. The Partnership acquired these Units using Net Cash Flow from operations.  The repurchases increase the remaining Limited Partners' ownership interest in the Partnership.  As a result of these repurchases and pursuant to the Partnership Agreement, the General Partners received distributions of $486 and $1,888 in 2019 and 2018, respectively.

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Balance Sheet (Parentheticals) - Limited Partner [Member] - shares	Sep. 30, 2019	Dec. 31, 2018
Limited Partners, units authorized	24,000	24,000
Limited Partners, units issued	19,264	19,329
Limited Partners, units outstanding	19,264	19,329

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Basis of Accounting

9 Months Ended

Sep. 30, 2019

Disclosure Text Block [Abstract]

Basis of Accounting [Text Block]

(1)  The condensed statements included herein have been prepared by the registrant, without audit, pursuant to the rules and regulations of the Securities and Exchange Commission, and reflect all adjustments which are, in the opinion of management, necessary to a fair statement of the results of operations for the interim period, on a basis consistent with the annual audited statements.  The adjustments made to these condensed statements consist only of normal recurring adjustments.  Certain information, accounting policies, and footnote disclosures normally included in financial statements prepared in accordance with United States Generally Accepted Accounting Principles (US GAAP) have been condensed or omitted pursuant to such rules and regulations, although the registrant believes that the disclosures are adequate to make the information presented not misleading.  It is suggested that these condensed financial statements be read in conjunction with the financial statements and the summary of significant accounting policies and notes thereto included in the registrant’s latest annual report on Form 10K.

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Balance Sheet - USD ($)	Sep. 30, 2019	Dec. 31, 2018
Current Assets:
Cash	$ 829,804	$ 993,307
Receivables	1,466	3,664
Total Current Assets	831,270	996,971
Real Estate Investments:
Land	2,959,461	3,659,461
Buildings	8,932,356	10,339,539
Acquired Intangible Lease Assets	621,258	807,178
Real Estate Held for Investment, at cost	12,513,075	14,806,178
Accumulated Depreciation and Amortization	(4,157,139)	(4,239,689)
Real Estate Held for Investment, Net	8,355,936	10,566,489
Real Estate Held for Sale	1,925,710	0
Total Real Estate Investments	10,281,646	10,566,489
Total Assets	11,112,916	11,563,460
Current Liabilities:
Payable to AEI Fund Management, Inc.	102,025	107,167
Distributions Payable	198,178	198,186
Total Current Liabilities	300,203	305,353
Long-term Liabilities:
Acquired Below-Market Lease Intangibles, Net	51,350	87,655
Partners’ Capital :
General Partners	(1,093)	2,998
Limited Partners – 24,000 Units authorized; 19,264 and 19,329 Units issued and outstanding as of 9/30/2019 and 12/31/2018	10,762,456	11,167,454
Total Partners' Capital	10,761,363	11,170,452
Total Liabilities and Partners' Capital	$ 11,112,916	$ 11,563,460

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Statement of Changes in Partners' Capital - USD ($)	General Partner [Member]	Limited Partner [Member]	Total
Balance at Dec. 31, 2017	$ 10,072	$ 11,867,738	$ 11,877,810
Balance (in Shares) at Dec. 31, 2017		19,615.64
Balance at Mar. 31, 2018	8,852	$ 11,746,967	11,755,819
Balance (in Shares) at Mar. 31, 2018		19,615.64
Distributions Declared	(1,982)	$ (196,198)	(198,180)
Net Income	762	75,427	76,189
Balance at Dec. 31, 2017	10,072	$ 11,867,738	11,877,810
Balance (in Shares) at Dec. 31, 2017		19,615.64
Balance at Sep. 30, 2018	4,577	$ 11,323,719	11,328,296
Balance (in Shares) at Sep. 30, 2018		19,402.30
Distributions Declared	(5,946)	$ (588,596)	(594,542)
Repurchase of Partnership Units	(1,888)	$ (186,957)
Units Repurchased (in Shares)		(213.34)
Net Income			233,873
Balance at Mar. 31, 2018	8,852	$ 11,746,967	11,755,819
Balance (in Shares) at Mar. 31, 2018		19,615.64
Balance at Jun. 30, 2018	5,695	$ 11,434,379	11,440,074
Balance (in Shares) at Jun. 30, 2018		19,402.30
Distributions Declared	(1,982)	$ (196,199)	(198,181)
Repurchase of Partnership Units	(1,888)	$ (186,957)	(188,845)
Units Repurchased (in Shares)		(213.34)
Net Income	713	$ 70,568	71,281
Balance at Sep. 30, 2018	4,577	$ 11,323,719	11,328,296
Balance (in Shares) at Sep. 30, 2018		19,402.30
Distributions Declared	(1,982)	$ (196,199)	(198,181)
Net Income	864	85,539	86,403
Balance at Dec. 31, 2018	2,998	$ 11,167,454	11,170,452
Balance (in Shares) at Dec. 31, 2018		19,329
Balance at Mar. 31, 2019	1,835	$ 11,052,286	11,054,121
Balance (in Shares) at Mar. 31, 2019		19,328.64
Distributions Declared	(1,982)	$ (196,204)	(198,186)
Net Income	819	81,036	81,855
Balance at Dec. 31, 2018	2,998	$ 11,167,454	11,170,452
Balance (in Shares) at Dec. 31, 2018		19,329
Balance at Sep. 30, 2019	(1,093)	$ 10,762,456	10,761,363
Balance (in Shares) at Sep. 30, 2019		19,264
Distributions Declared	(5,945)	$ (588,597)	(594,542)
Repurchase of Partnership Units	(486)	$ (48,051)
Units Repurchased (in Shares)		(64.66)
Net Income			233,990
Balance at Mar. 31, 2019	1,835	$ 11,052,286	11,054,121
Balance (in Shares) at Mar. 31, 2019		19,328.64
Balance at Jun. 30, 2019	95	$ 10,880,152	10,880,247
Balance (in Shares) at Jun. 30, 2019		19,263.98
Distributions Declared	(1,982)	$ (196,196)	(198,178)
Repurchase of Partnership Units	(486)	$ (48,051)	(48,537)
Units Repurchased (in Shares)		(64.66)
Net Income	728	$ 72,113	72,841
Balance at Sep. 30, 2019	(1,093)	$ 10,762,456	10,761,363
Balance (in Shares) at Sep. 30, 2019		19,264
Distributions Declared	(1,981)	$ (196,197)	(198,178)
Net Income	$ 793	$ 78,501	$ 79,294

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Partners' Capital (Details) - USD ($)	3 Months Ended						9 Months Ended
	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Sep. 30, 2019	Sep. 30, 2018
Partners' Capital (Details) [Line Items]
Distribution Made to Limited Partner, Cash Distributions Declared	$ 198,178	$ 198,178	$ 198,186	$ 198,181	$ 198,181	$ 198,180	$ 594,542	$ 594,542
Sale Proceeds Distribution Made To Member Or Limited Partner							64,513	197,980
Partners' Capital Account, Redemptions		48,537			188,845
Limited Partner [Member]
Partners' Capital (Details) [Line Items]
Distribution Made to Limited Partner, Cash Distributions Declared	196,197	$ 196,196	196,204	196,199	$ 196,199	196,198	$ 588,597	$ 588,596
Distribution Made to Limited Partner, Distributions Declared, Per Unit (in Dollars per share)							$ 30.52	$ 30.23
Weighted Average Limited Partnership Units Outstanding, Basic (in Shares)							19,286	19,473
DistributionsPerUnitOfNetIncome (in Dollars per share)							$ 9.52	$ 2.25
DistributionsPerUnitOfReturnOfCapital (in Dollars per share)							$ 21.00	$ 27.98
Sale Proceeds Distribution Made To Member Or Limited Partner							$ 63,868	$ 196,000
SaleProceedsDistributionMadetoLimitedPartnerPerUnit (in Dollars per share)							$ 3.32	$ 10.10
Partners' Capital Account, Units, Redeemed (in Shares)		64.66			213.34		64.66	213.34
Partners' Capital Account, Redemptions		$ 48,051			$ 186,957		$ 48,051	$ 186,957
General Partner [Member]
Partners' Capital (Details) [Line Items]
Distribution Made to Limited Partner, Cash Distributions Declared	$ 1,981	1,982	$ 1,982	$ 1,982	1,982	$ 1,982	5,945	5,946
Sale Proceeds Distribution Made To Member Or Limited Partner							645	1,980
Partners' Capital Account, Redemptions		$ 486			$ 1,888		$ 486	$ 1,888

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Fair Value Measurements

9 Months Ended

Sep. 30, 2019

Fair Value Disclosures [Abstract]

Fair Value Disclosures [Text Block]

(7)  Fair Value Measurements –

As of September 30, 2019 and December 31, 2018, the Partnership had no assets or liabilities measured at fair value on a recurring basis or nonrecurring basis.