of these 2 I like entry #4 better than #3. I'd probably take the red roof color down a notch... maybe to contrasting to the blueprint... maybe just dull it down or test some other colors and see what you think.
Check out this image:
http://fc01.deviantart.net/fs70/i/2011/253/d/d/rg_logo_blueprint_by_banzaibird-d49endn.jpgI like how it has multiple parts to it... one main thing centered with a few smaller items around it... perhaps using my company name on the bottom right. A smaller image on the bottom left and top right that incorporates into building, houses, realtors, business, perhaps a hint of the remax balloon... without it being recognized as the actual company logo... if that makes sense.