To unlock this property, build a hotel on any property. Of course, to do this, you'll need a monopoly on any color (I can't confirm that this trophy is unlockable with the "Property Improvements" House Rule).
Start a game with two players where you control both players. Trade whatever you need to Player One to get a monopoly. Once you have the monopoly, simply view your properties after your turn and go to the monopoly. At this point, build up the properties with houses. Once all of them have four houses, you'll be able to build hotels on them. Build a hotel on any of them to unlock this trophy.
This trophy is pretty similar to the "VIP" trophy. You will have to get that trophy while going for this one.