From YPPedia

An owner of a building (including shoppes, infrastructure buildings, and house gateway buildings), stall, house, or ship is someone who manages the building or stall, along with the managers. Owners have all the powers of the managers, as well as the ability to add or remove managers. Ownership of a ship confers the ability to lock that ship, although the owner must be an officer in a crew in order to control the ship, regardless of ownership. For buildings and ships, ownership goes to the pirate who possesses the deed. For stalls and houses, ownership is set and cannot be transferred.