idea 1 : Now, concerning the UX, Key traction user is the seller.
When you go to "seller", it directly ask for my adress. At beginning, I didn't want to give it. not now. but I have no other choice. SO I did it. and then, you did a great job with the house finder and market price.
But I think there might be some defects at that step. You should track and or test this step. Maybe you could say more at the beginning : "We're happy to offer you a free estimate of your property, please locate it and directly see a price estimate".
Idea 2 : Seller might not search for an online real estate at beginning but for sure, they want to know more about the market. Your site should give more at beginning and transform them after.
There is a French startup very successfull : http://www.meilleursagents.com/
, who has a business like this : They have the best tool ever to estimate your property for free (very big traction of qualified prospects), and then they transform them as seller and connect them to local real estate agency.
When you type a Parisian adress in google.fr, they are on the first results with the average estate price in the area.