Compose a professional letter, telling a little bit about your business and stating that you have GL insurance and workmans comp. Now mail this letters to your area's real estate management firms. The other day I drove around and just passed out 4 business cards. I got an "invitation to bid" package in the mail a few days later from one of them. It has a lot of properties on there. Shopping malls, condos, apartments and other residentals. I have to return my bids by November 15th. Upon acceptance, I have to show proof of insurance and workmans comp.