[imported_Vulcan]

everything static on the world is on sale as long as it doesnt has any npc inside

Well thats not entirely true. If the building has some other function, like the lighthouse is a passageway between Felucca and the Lost Lands and won't be sold.

If a building has npcs, it may still be sold, depending on what npcs. Tailor Shops, Mages, and Banks probably won't be sold, but if its a remote city then might still be possible.

Most other npcs can be shifted so don't worry too much if there are npcs inside.