I?m trying to help a client establish the market size for an upscale
private home community development. It would be great to get an
understanding of:

   a) The number of people in the U.S. with a net worth of $5 million+,   
      $10 million+ and $25 million+ 
   b) How many individuals/families in each of these groups own 2 or more 
      homes 
   c) The amount of people in each of these groups that have made donations to 
      environmental causes in the past 3 years, or generally consider   
      themselves supportive or environmental/conservation issues. 
 
Any other demographic or psychographic information on these
individuals would also be very helpful.