The Company is the lessor for its residential and non-residential leases and these leases are accounted for as operating leases under the lease standard.

For the quarter ended March 31, 2022, approximately 97% of the Company’s total lease revenue is generated from residential apartment leases that are generally twelve months or less in length. The residential apartment leases may include lease income related to such items as utility recoveries, parking rent, storage rent and pet rent that the Company treats as a single lease component because the amenities cannot be leased on their own and the timing and pattern of revenue recognition are the same. The collection of lease payments at lease commencement is probable and therefore the Company subsequently recognizes lease income over the lease term on a straight-line basis. Residential leases are renewable upon consent of both parties on an annual or monthly basis.

For the quarter ended March 31, 2022, approximately 3% of the Company’s total lease revenue is generated by non-residential leases that are generally for terms ranging between five to ten years. The non-residential leases generally consist of ground floor retail spaces and master-leased parking garages that serve as additional amenities for our residents. The non-residential leases may include lease income related to such items as utility recoveries, parking rent and storage rent that the Company treats as a single lease component because the amenities cannot be leased on their own and the timing and pattern of revenue recognition are the same. The collection of lease payments at lease commencement is probable and therefore the Company subsequently recognizes lease income over the lease term on a straight-line basis. Non-residential leases are renewable with market-based renewal options.

The following table presents the lease income types relating to lease payments for residential and non-residential leases along with the total other rental income for the quarters ended March 31, 2022 and 2021 (amounts in thousands):

	Quarter Ended March 31, 2022									Quarter Ended March 31, 2021
Income Type	Residential Leases			Non-Residential Leases			Total			Residential Leases			Non-Residential Leases		Total
Residential and non-residential rent	$	586,890		$	15,874		$	602,764		$	539,655		$	15,839	$	555,494
Utility recoveries (RUBS income) (1)		19,598			181			19,779			17,954			178		18,132
Parking rent		10,783			98			10,881			9,734			267		10,001
Other lease revenue (2)		(6,301	)		(43	)		(6,344	)		(10,262	)		609		(9,653	)
Total lease revenue	$	610,970		$	16,110			627,080		$	557,081		$	16,893		573,974
Parking revenue								8,808								5,433
Other revenue								17,460								18,195
Total other rental income (3)								26,268								23,628
Rental income							$	653,348							$	597,602

The following table presents residential and non-residential accounts receivable and straight-line receivable balances for the Company’s properties as of March 31, 2022 and December 31, 2021 (amounts in thousands):

	Residential							Non-Residential
Balance Sheet (Other assets):	March 31, 2022				December 31, 2021			March 31, 2022			December 31, 2021
Resident/tenant accounts receivable balances	$	43,267			$	37,959		$	3,639		$	3,218
Allowance for doubtful accounts		(38,774	)			(33,121	)		(2,379	)		(2,365	)
Net receivable balances	$	4,493		(1)	$	4,838		$	1,260		$	853

Straight-line receivable balances	$	5,542			$	7,460		$	13,301		$	13,021

The following table presents residential bad debt for the Company’s properties for the quarters ended March 31, 2022 and 2021 (amounts in thousands):