I'd sooner sell off the regular community buildings and houses before any of the premium ones. They all have some of the best XP per hour payouts in the game and don't require you to obsessively collect every 5 minutes. If you're really hard up for space I'd get rid of the Fisheries before the Taverns. Taverns have a better XP per hour payout but take up 33% less space than the Fishery does.