The following is an abbreviated version of the apartment owners portion of the 2012 NMHC 50, an annual ranking of the 50 largest U.S. apartment owners and managers published in NREI's April issue. The companies below are ranked according to the number of apartment units in which they had an ownership interest as of Jan. 1, 2011.

1. Boston Capital
Units Owned: 157,423
PH: 617.624.8900
www.bostoncapital.com

2. Centerline Capital Group
Units Owned: 150,000
PH: 212.317.5700
www.centerline.com

3. Boston Financial Investment Management L.P.
Units Owned: 140,077
PH: 800.782.7890
www.bfim.com

4. SunAmerica Affordable Housing Partners Inc.
Units Owned: 134,882
PH: 310.772.6000
www.sunamericahousing.com

5. PNC Real Estate
Units Owned: 126,260
PH: 877.762.7775
www.pnc.com/realestate

6. Equity Residential
Units Owned: 119,743
PH: 312.474.1300
www.equityapartments.com

7. Hunt Companies Inc.
Units Owned: 114,712
PH: 915.553.1122
www.huntcompanies.com

8. National Equity Fund Inc.
Units Owned: 106,772
PH: 312.360.0400
www.nefinc.org

9. The Richman Group Affordable Housing Corp.
Units Owned: 98,770
PH: 800.333.3509
www.therichmangroup.com

10. Enterprise Community Investment Inc.
Units Owned: 97,822
www.enterprisecommunity.com

11. Aimco
Units Owned: 93,630
PH: 303.757.8101
www.aimco.com

12. Archstone
Units Owned: 73,955
PH: 303.708.5959
www.archstoneapartments.com

13. Alliant Capital Ltd.
Units Owned: 71,220
www.alliantcapital.com

14. Camden Property Trust
Units Owned: 66,997
PH: 713.354.2500
www.camdenliving.com

15. UDR Inc.
Units Owned: 57,743
PH: 720.283.6120
www.udr.com

16. AvalonBay Communities Inc.
Units Owned: 57,426
PH: 703.329.6300
www.avalonbay.com

17. Edward Rose & Sons
Units Owned: 56,385
www.edwardrose.com

18. Pinnacle Family of Companies
Units Owned: 52,655
PH: 206.215.9700
www.pinnaclefamily.com

19. WNC & Associates Inc.
Units Owned: 51,224
PH: 714.662.5565
www.wncinc.com

20. Invesco Real Estate
Units Owned: 51,125
404.479.1095
www.institutional.invesco.com

21. MAA
Units Owned: 49,407
PH: 901.682.6600
www.maac.com

22. The Related Companies
Units Owned: 48,967
PH: 212.801.100
www.related.com

23. Forest City Residential Group Inc.
Units Owned: 48,482
www.forestcity.net

24. J.P. Morgan Asset Management
Units Owned: 47,587
www.jpmoregan.com/pages/jpmorgan/am

25. JRK Property Holdings Inc.
Units Owned: 47,398
PH: 310.268.8344
www.jrkpropholdings.com