SCHEDULE III - REAL ESTATE PROPERTIES AND ACCUMULATED DEPRECIATION (Details) $ in Thousands	12 Months Ended
	Sep. 30, 2017 USD ($)
Real estate properties and accumulated depreciation
Encumbrances	$ 704,170
Initial Cost to Company
Land	140,511
Buildings and Improvements	771,391
Costs Capitalized Subsequent to Acquisition
Land	49
Improvements	68,068
Carrying Costs	318
Gross Amount At Which Carried at September 30, 2017
Land	138,095
Buildings and Improvements	839,777
Total	977,872
Accumulated Depreciation	66,622
Commercial | Yonkers, NY
Real estate properties and accumulated depreciation
Encumbrances	1,448
Initial Cost to Company
Land	0
Buildings and Improvements	4,000
Costs Capitalized Subsequent to Acquisition
Land	0
Improvements	320
Carrying Costs	0
Gross Amount At Which Carried at September 30, 2017
Land	0
Buildings and Improvements	4,320
Total	4,320
Accumulated Depreciation	$ 1,837
Depreciation Life For Latest Income Statement	39 years
Commercial | South Daytona, FL
Real estate properties and accumulated depreciation
Encumbrances	$ 0
Initial Cost to Company
Land	10,437
Buildings and Improvements	0
Costs Capitalized Subsequent to Acquisition
Land	49
Improvements	0
Carrying Costs	0
Gross Amount At Which Carried at September 30, 2017
Land	8,021
Buildings and Improvements	0
Total	8,021
Accumulated Depreciation	0
Multi-family residential | Palm Beach Gardens, FL
Real estate properties and accumulated depreciation
Encumbrances	46,176
Initial Cost to Company
Land	16,260
Buildings and Improvements	43,132
Costs Capitalized Subsequent to Acquisition
Land	0
Improvements	4,560
Carrying Costs	0
Gross Amount At Which Carried at September 30, 2017
Land	16,260
Buildings and Improvements	47,692
Total	63,952
Accumulated Depreciation	$ 9,921
Depreciation Life For Latest Income Statement	30 years
Multi-family residential | Melbourne, FL
Real estate properties and accumulated depreciation
Encumbrances	$ 9,033
Initial Cost to Company
Land	1,150
Buildings and Improvements	8,680
Costs Capitalized Subsequent to Acquisition
Land	0
Improvements	1,471
Carrying Costs	0
Gross Amount At Which Carried at September 30, 2017
Land	1,150
Buildings and Improvements	10,151
Total	11,301
Accumulated Depreciation	$ 2,332
Depreciation Life For Latest Income Statement	30 years
Multi-family residential | North Charleston, SC
Real estate properties and accumulated depreciation
Encumbrances	$ 16,793
Initial Cost to Company
Land	2,436
Buildings and Improvements	18,970
Costs Capitalized Subsequent to Acquisition
Land	0
Improvements	1,112
Carrying Costs	0
Gross Amount At Which Carried at September 30, 2017
Land	2,436
Buildings and Improvements	20,082
Total	22,518
Accumulated Depreciation	$ 3,547
Depreciation Life For Latest Income Statement	30 years
Multi-family residential | Decatur, GA
Real estate properties and accumulated depreciation
Encumbrances	$ 15,094
Initial Cost to Company
Land	1,698
Buildings and Improvements	8,676
Costs Capitalized Subsequent to Acquisition
Land	0
Improvements	1,574
Carrying Costs	0
Gross Amount At Which Carried at September 30, 2017
Land	1,698
Buildings and Improvements	10,250
Total	11,948
Accumulated Depreciation	$ 1,804
Depreciation Life For Latest Income Statement	30 years
Multi-family residential | Houston, TX (Stonecrossing)
Real estate properties and accumulated depreciation
Encumbrances	$ 12,659
Initial Cost to Company
Land	5,143
Buildings and Improvements	11,524
Costs Capitalized Subsequent to Acquisition
Land	0
Improvements	464
Carrying Costs	0
Gross Amount At Which Carried at September 30, 2017
Land	5,143
Buildings and Improvements	11,988
Total	17,131
Accumulated Depreciation	$ 1,937
Depreciation Life For Latest Income Statement	30 years
Multi-family residential | Houston, TX (Stonecrossing East)
Real estate properties and accumulated depreciation
Encumbrances	$ 7,270
Initial Cost to Company
Land	3,044
Buildings and Improvements	5,463
Costs Capitalized Subsequent to Acquisition
Land	0
Improvements	930
Carrying Costs	0
Gross Amount At Which Carried at September 30, 2017
Land	3,044
Buildings and Improvements	6,393
Total	9,437
Accumulated Depreciation	$ 984
Depreciation Life For Latest Income Statement	30 years
Multi-family residential | Huntsville, AL
Real estate properties and accumulated depreciation
Encumbrances	$ 12,064
Initial Cost to Company
Land	1,047
Buildings and Improvements	10,942
Costs Capitalized Subsequent to Acquisition
Land	0
Improvements	1,599
Carrying Costs	0
Gross Amount At Which Carried at September 30, 2017
Land	1,047
Buildings and Improvements	12,541
Total	13,588
Accumulated Depreciation	$ 1,824
Depreciation Life For Latest Income Statement	30 years
Multi-family residential | Columbus, OH
Real estate properties and accumulated depreciation
Encumbrances	$ 9,957
Initial Cost to Company
Land	1,372
Buildings and Improvements	12,678
Costs Capitalized Subsequent to Acquisition
Land
Improvements	469
Carrying Costs	0
Gross Amount At Which Carried at September 30, 2017
Land	1,372
Buildings and Improvements	13,147
Total	14,519
Accumulated Depreciation	$ 1,950
Depreciation Life For Latest Income Statement	30 years
Multi-family residential | Indianapolis, IN
Real estate properties and accumulated depreciation
Encumbrances	$ 14,375
Initial Cost to Company
Land	4,477
Buildings and Improvements	14,240
Costs Capitalized Subsequent to Acquisition
Land	0
Improvements	2,476
Carrying Costs	0
Gross Amount At Which Carried at September 30, 2017
Land	4,477
Buildings and Improvements	16,716
Total	21,193
Accumulated Depreciation	$ 2,276
Depreciation Life For Latest Income Statement	30 years
Multi-family residential | Nashville, TN
Real estate properties and accumulated depreciation
Encumbrances	$ 23,181
Initial Cost to Company
Land	4,565
Buildings and Improvements	22,054
Costs Capitalized Subsequent to Acquisition
Land
Improvements	2,744
Carrying Costs	0
Gross Amount At Which Carried at September 30, 2017
Land	4,565
Buildings and Improvements	24,798
Total	29,363
Accumulated Depreciation	$ 2,921
Depreciation Life For Latest Income Statement	30 years
Multi-family residential | Houston, TX (Kendall)
Real estate properties and accumulated depreciation
Encumbrances	$ 15,242
Initial Cost to Company
Land	1,849
Buildings and Improvements	13,346
Costs Capitalized Subsequent to Acquisition
Land	0
Improvements	2,009
Carrying Costs	0
Gross Amount At Which Carried at September 30, 2017
Land	1,849
Buildings and Improvements	15,355
Total	17,204
Accumulated Depreciation	$ 1,869
Depreciation Life For Latest Income Statement	30 years
Multi-family residential | Pensacola, FL
Real estate properties and accumulated depreciation
Encumbrances	$ 19,349
Initial Cost to Company
Land	2,758
Buildings and Improvements	25,192
Costs Capitalized Subsequent to Acquisition
Land	0
Improvements	584
Carrying Costs	0
Gross Amount At Which Carried at September 30, 2017
Land	2,758
Buildings and Improvements	25,776
Total	28,534
Accumulated Depreciation	$ 2,669
Depreciation Life For Latest Income Statement	30 years
Multi-family residential | Valley, AL
Real estate properties and accumulated depreciation
Encumbrances	$ 28,990
Initial Cost to Company
Land	1,040
Buildings and Improvements	42,710
Costs Capitalized Subsequent to Acquisition
Land	0
Improvements	907
Carrying Costs	0
Gross Amount At Which Carried at September 30, 2017
Land	1,040
Buildings and Improvements	43,617
Total	44,657
Accumulated Depreciation	$ 3,722
Depreciation Life For Latest Income Statement	30 years
Multi-family residential | San Marcos, TX
Real estate properties and accumulated depreciation
Encumbrances	$ 17,158
Initial Cost to Company
Land	2,163
Buildings and Improvements	19,562
Costs Capitalized Subsequent to Acquisition
Land	0
Improvements	218
Carrying Costs	0
Gross Amount At Which Carried at September 30, 2017
Land	2,163
Buildings and Improvements	19,780
Total	21,943
Accumulated Depreciation	$ 1,706
Depreciation Life For Latest Income Statement	30 years
Multi-family residential | Lake St. Louis, MO
Real estate properties and accumulated depreciation
Encumbrances	$ 26,814
Initial Cost to Company
Land	2,752
Buildings and Improvements	33,248
Costs Capitalized Subsequent to Acquisition
Land	0
Improvements	746
Carrying Costs	0
Gross Amount At Which Carried at September 30, 2017
Land	2,752
Buildings and Improvements	33,994
Total	36,746
Accumulated Depreciation	$ 2,627
Depreciation Life For Latest Income Statement	30 years
Multi-family residential | North Charleston, MO
Real estate properties and accumulated depreciation
Encumbrances	$ 29,592
Initial Cost to Company
Land	5,538
Buildings and Improvements	0
Costs Capitalized Subsequent to Acquisition
Land
Improvements	35,105
Carrying Costs	318
Gross Amount At Which Carried at September 30, 2017
Land	5,538
Buildings and Improvements	35,423
Total	40,961
Accumulated Depreciation	$ 727
Depreciation Life For Latest Income Statement	30 years
Multi-family residential | La Grange, GA
Real estate properties and accumulated depreciation
Encumbrances	$ 15,452
Initial Cost to Company
Land	832
Buildings and Improvements	21,968
Costs Capitalized Subsequent to Acquisition
Land	0
Improvements	429
Carrying Costs	0
Gross Amount At Which Carried at September 30, 2017
Land	832
Buildings and Improvements	22,397
Total	23,229
Accumulated Depreciation	$ 1,532
Depreciation Life For Latest Income Statement	30 years
Multi-family residential | Katy, TX
Real estate properties and accumulated depreciation
Encumbrances	$ 30,750
Initial Cost to Company
Land	4,194
Buildings and Improvements	36,056
Costs Capitalized Subsequent to Acquisition
Land
Improvements	(3,517)
Carrying Costs	0
Gross Amount At Which Carried at September 30, 2017
Land	4,194
Buildings and Improvements	32,539
Total	36,733
Accumulated Depreciation	$ 2,345
Depreciation Life For Latest Income Statement	30 years
Multi-family residential | Macon, GA
Real estate properties and accumulated depreciation
Encumbrances	$ 11,200
Initial Cost to Company
Land	1,876
Buildings and Improvements	12,649
Costs Capitalized Subsequent to Acquisition
Land	0
Improvements	399
Carrying Costs	0
Gross Amount At Which Carried at September 30, 2017
Land	1,876
Buildings and Improvements	13,048
Total	14,924
Accumulated Depreciation	$ 937
Depreciation Life For Latest Income Statement	30 years
Multi-family residential | Southaven, MS (Civic Center I)
Real estate properties and accumulated depreciation
Encumbrances	$ 28,000
Initial Cost to Company
Land	2,090
Buildings and Improvements	32,910
Costs Capitalized Subsequent to Acquisition
Land	0
Improvements	1,831
Carrying Costs	0
Gross Amount At Which Carried at September 30, 2017
Land	2,090
Buildings and Improvements	34,741
Total	36,831
Accumulated Depreciation	$ 2,154
Depreciation Life For Latest Income Statement	30 years
Multi-family residential | San Antonio, TX (Location 1)
Real estate properties and accumulated depreciation
Encumbrances	$ 26,400
Initial Cost to Company
Land	5,540
Buildings and Improvements	29,610
Costs Capitalized Subsequent to Acquisition
Land	0
Improvements	699
Carrying Costs	0
Gross Amount At Which Carried at September 30, 2017
Land	5,540
Buildings and Improvements	30,309
Total	35,849
Accumulated Depreciation	$ 2,283
Depreciation Life For Latest Income Statement	30 years
Multi-family residential | Dallas, TX
Real estate properties and accumulated depreciation
Encumbrances	$ 27,938
Initial Cost to Company
Land	13,073
Buildings and Improvements	23,927
Costs Capitalized Subsequent to Acquisition
Land	0
Improvements	2,128
Carrying Costs	0
Gross Amount At Which Carried at September 30, 2017
Land	13,073
Buildings and Improvements	26,055
Total	39,128
Accumulated Depreciation	$ 1,539
Depreciation Life For Latest Income Statement	30 years
Multi-family residential | Columbia, SC
Real estate properties and accumulated depreciation
Encumbrances	$ 12,934
Initial Cost to Company
Land	2,233
Buildings and Improvements	14,767
Costs Capitalized Subsequent to Acquisition
Land	0
Improvements	751
Carrying Costs	0
Gross Amount At Which Carried at September 30, 2017
Land	2,233
Buildings and Improvements	15,518
Total	17,751
Accumulated Depreciation	$ 1,050
Depreciation Life For Latest Income Statement	30 years
Multi-family residential | Atlanta, GA (Location 2)
Real estate properties and accumulated depreciation
Encumbrances	$ 27,375
Initial Cost to Company
Land	10,347
Buildings and Improvements	28,777
Costs Capitalized Subsequent to Acquisition
Land	0
Improvements	888
Carrying Costs	0
Gross Amount At Which Carried at September 30, 2017
Land	10,347
Buildings and Improvements	29,665
Total	40,012
Accumulated Depreciation	$ 1,918
Depreciation Life For Latest Income Statement	30 years
Multi-family residential | Southaven, MS (Civic Center II)
Real estate properties and accumulated depreciation
Encumbrances	$ 30,564
Initial Cost to Company
Land	2,077
Buildings and Improvements	36,128
Costs Capitalized Subsequent to Acquisition
Land	0
Improvements	609
Carrying Costs	0
Gross Amount At Which Carried at September 30, 2017
Land	2,077
Buildings and Improvements	36,737
Total	38,814
Accumulated Depreciation	$ 2,101
Depreciation Life For Latest Income Statement	30 years
Multi-family residential | San Antonio, TX (Location 2)
Real estate properties and accumulated depreciation
Encumbrances	$ 27,000
Initial Cost to Company
Land	4,620
Buildings and Improvements	31,380
Costs Capitalized Subsequent to Acquisition
Land	0
Improvements	680
Carrying Costs	0
Gross Amount At Which Carried at September 30, 2017
Land	4,620
Buildings and Improvements	32,060
Total	36,680
Accumulated Depreciation	$ 1,775
Depreciation Life For Latest Income Statement	30 years
Multi-family residential | Fredricksburg, VA
Real estate properties and accumulated depreciation
Encumbrances	$ 29,441
Initial Cost to Company
Land	6,985
Buildings and Improvements	32,148
Costs Capitalized Subsequent to Acquisition
Land	0
Improvements	550
Carrying Costs	0
Gross Amount At Which Carried at September 30, 2017
Land	6,985
Buildings and Improvements	32,698
Total	39,683
Accumulated Depreciation	$ 1,368
Depreciation Life For Latest Income Statement	30 years
Multi-family residential | St. Louis, MO (Tower at OPOP)
Real estate properties and accumulated depreciation
Encumbrances	$ 20,000
Initial Cost to Company
Land	192
Buildings and Improvements	27,231
Costs Capitalized Subsequent to Acquisition
Land	0
Improvements	3
Carrying Costs	0
Gross Amount At Which Carried at September 30, 2017
Land	192
Buildings and Improvements	27,234
Total	27,426
Accumulated Depreciation	$ 693
Depreciation Life For Latest Income Statement	30 years
Multi-family residential | St. Louis, MO (Lofts at OPOP)
Real estate properties and accumulated depreciation
Encumbrances	$ 6,197
Initial Cost to Company
Land	329
Buildings and Improvements	7,805
Costs Capitalized Subsequent to Acquisition
Land	0
Improvements	12
Carrying Costs	0
Gross Amount At Which Carried at September 30, 2017
Land	329
Buildings and Improvements	7,817
Total	8,146
Accumulated Depreciation	$ 280
Depreciation Life For Latest Income Statement	30 years
Multi-family residential | Creve Coeur, MO
Real estate properties and accumulated depreciation
Encumbrances	$ 29,000
Initial Cost to Company
Land	2,270
Buildings and Improvements	37,899
Costs Capitalized Subsequent to Acquisition
Land	0
Improvements	48
Carrying Costs	0
Gross Amount At Which Carried at September 30, 2017
Land	2,270
Buildings and Improvements	37,947
Total	40,217
Accumulated Depreciation	$ 832
Depreciation Life For Latest Income Statement	30 years
Multi-family residential | West Nashville, TN
Real estate properties and accumulated depreciation
Encumbrances	$ 0
Initial Cost to Company
Land	5,228
Buildings and Improvements	0
Costs Capitalized Subsequent to Acquisition
Land	0
Improvements	5,219
Carrying Costs	0
Gross Amount At Which Carried at September 30, 2017
Land	5,228
Buildings and Improvements	5,219
Total	10,447
Accumulated Depreciation	$ 0
Depreciation Life For Latest Income Statement	30 years
Multi-family residential | Farmers Branch, TX
Real estate properties and accumulated depreciation
Encumbrances	$ 55,200
Initial Cost to Company
Land	7,343
Buildings and Improvements	79,347
Costs Capitalized Subsequent to Acquisition
Land	0
Improvements	24
Carrying Costs	0
Gross Amount At Which Carried at September 30, 2017
Land	7,343
Buildings and Improvements	79,371
Total	86,714
Accumulated Depreciation	$ 1,046
Depreciation Life For Latest Income Statement	30 years
Multi-family residential | Tallahassee, FL
Real estate properties and accumulated depreciation
Encumbrances	$ 21,524
Initial Cost to Company
Land	3,553
Buildings and Improvements	24,372
Costs Capitalized Subsequent to Acquisition
Land	0
Improvements	27
Carrying Costs	0
Gross Amount At Which Carried at September 30, 2017
Land	3,553
Buildings and Improvements	24,399
Total	27,952
Accumulated Depreciation	$ 116
Depreciation Life For Latest Income Statement	30 years