Well what I meant by that is that they are already privately owned on small lots. Even if zoning permitted it, it wouldn't work to build a 20 unit apartment bu

Well what I meant by that is that they are already privately owned on small lots. Even if zoning permitted it, it wouldn't work to build a 20 unit apartment building in between two of these: http://sfcitizen.com/blog/wp-content/uploads/2011/04/go8f6701-copy.jpg http://sfcitizen.com/blog/wp-content/uploads/2011/04/go8f670... In order to build a denser apartment building, a developer would have to buy up whole blocks of these homes. Which means that clusters of home owners all have to agree to sell their property. Which seems unlikely to ever happen.