I don't think a LS house is a good idea. LS is supposed to be a chat channel that links players, while free company is what other MMOs have as guilds. So, a personal home and a free company area make sense.

It would be really cool if they allowed free company leaders to create a custom map for the free company which would then be somehow incorporated in the game, for a very high fee so that only big companies can afford it.... but I don't see that happening outside fictional scenarios like .hack// series xD