You can buy and sell property through the Dynasty 8 website. If you don't want any buildings and just want the money, the only thing you can really do is replace them with the cheapest, lousiest buildings Los Santos has to offer, in order to maximise your profit. This still means you can profit by selling buildings, however: you can buy a garage for $25,000 and exchange it for a nightclub worth $750,000, essentially earning $725,000 overall (and you get to keep a rat-infested garage in the process). You don't sell property so much as swap it, off-setting the value with the money made on selling the old building. However, you can't sell a building without essentially exchanging it for another. Players can have multiple pieces of property at a time, including apartments, garages, nightclubs, offices and warehouses, depending on what they've unlocked, and selling property is often about exchanging buildings.

Yes, though it's not as simple as just putting it on the market. How Many Properties Can I Own in GTA Online?.

Gta v arcade garage