The following is an abbreviated version of the apartment management 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 they managed as of Jan. 1, 2012.

1. Greystar Real Estate Partners LLC
Units Managed: 192,711
PH: 602.522.1200
www.greystar.com

2. Riverstone Residential Group
Units Managed: 170,341
PH: 713.343.3500
www.riverstoneres.com

3. Lincoln Property Co.
Units Managed: 144,033
PH: 214.740.3300
www.lpc.com

4. Pinnacle Family of Companies
Units Managed: 138,638
PH: 206.215.9700
www.pinnaclefamily.com

5. Equity Residential
Units Managed: 119,743
PH: 312.474.1300
www.equityapartments.com

6. WinnCompanies
Units Managed: 91,920
PH: 617.742.4500
www.winncompanies.com

7. Aimco
Units Managed: 88,530
PH: 303.757.8101
www.aimco.com

8. Archstone
Units Managed: 77,997
PH: 303.708.5959
www.archstoneapartments.com

9. Camden Property Trust
Units Managed: 67,217
PH: 713.354.2500
www.camdenliving.com

10. Bell Partners Inc.
Units Managed: 65,205
PH: 336.232.1900
www.bellpartnersinc.com

11. FPI Management Inc.
Units Managed: 63,002
PH: 916.357.5300
www.fpimgt.com

12. Apartment Management Consultants LLC
Units Managed: 59,856
PH: 801.565.7430
www.amcllc.net

13. UDR Inc.
Units Managed: 57,743
PH: 720.283.6120
www.udr.com

14. AvalonBay Communities Inc.
Units Managed: 57,426
PH: 703.329.6300
www.avalonbay.com

15. Alliance Residential Co.
Units Managed: 56,952
www.allresco.com

16. Edward Rose & Sons
Units Managed: 56,385
www.edwardrose.com

17. Hunt Companies Inc.
Units Managed: 51,281
PH: 915.553.1122
www.huntcompanies.com

18. MAA
Units Managed: 49,407
PH: 901.682.6600
www.maac.com

19. Fairfield Residential Company LLC
Units Managed: 49,053
PH: 858.457.2123
www.fairfieldresidential.com

20. The ConAm Group of Companies
Units managed: 46,700
PH: 858.614.7200
www.conam.com

21. BH Management Services Inc.
Units managed: 45,907
PH: 515.244.2622
www.bhmanagement.com

22. JRK Property Holdings Inc.
Units managed: 45,422
PH: 310.268.8344
www.jrkpropholdings.com

23. The Related Companies
Units managed: 44,289
PH: 212.801.100
www.related.com

24. Westdale Real Estate Investment & Management
Units managed: 43,883
PH: 214.515.7000
www.westdale.com

25. Home Properties Inc.
Units managed: 41,951
www.homeproperties.com