Answer:
If these are commercial buildings that are being constructed, I am not aware of any prohibition. If these are residential homes, RESPA section 8 prohibits referral fees.
You may want to review a few memo's from the FDIC on this.
The first is FIL 21-99 at:http://www.fdic.gov/news/news/financial/1999/fil9921.html
The second is FIL 103-99 which can be found at: http://www.fdic.gov/news/news/financial/1999/fil99103.html
First published on BankersOnline.com 11/18/02