[Balanor]

You can transfer a building directly to another PC by using your house key on them twice within 30 seconds.

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Edit: I just confirmed this is on the description of the key itself (bolded text emphasized here by me) -

This is a key that will open all exterior and interior doors to a specific player-owned property.

Taxes to a property must be paid every year (84 days real-time) to a Deedmaster or the property will be lost.

The owner of a property may use this key to:
-Make copies of this key at a Key Duplicator
-Use it on the property's doors to improve locks, door strength, and lock or unlock them
-Use it on another PC to transfer ownership of the property to that person
-If used on the entrance to the property, the owner may choose to relinquish his or her claim to the property

Any Player may use a building key to:
-Use it on or near a piece of furniture to rotate, raise, lower, or pick it up (even if it is not their property)