Find a hall in the Washington, DC area to accomodate 1000 to 1500 people

Here is one which I hope suits:
   
"East Hall is now a versatile space for evening events. The
architectural and decorative embellishments, a flat, glass- coffered
ceiling, colorful, hand-painted murals, marble floors and ionic
columns, provide an elegant setting for standing receptions for 800
guests, seated dinners for 500 guests, and as many as 1,500 guests
when used in conjunction with Columbus Club and Palm Court."
   
http://www.unionstationevents.com/sites/easthall.html
   
   
Contact information:
  
Special Events at Union Station
50 Massachusetts Avenue, NE
Washington, DC 20002
   
Phone: 202-289-8300
Fax: 202-289-7268
   
Website: http://www.unionstationevents.com/
  
  
 
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Search strategy:
washington halls hire
  
  
I hope this helps.
  
Best regards,
jackburton-ga

This site should be able to help you.  Click on "search facilities" 

http://www.washington.org/index.cfm?blnNavView=True&idContentType=431&idCurrentPage=32