Under the current OS/Homestead conditions, the most prudent addition of sims would be full sims to be parcelled and rented. I could see a Homestead for the Schloss, but that would promptly limit it as an event venue.
However, if I may direct everyone's view to the sim of Aggro, they found a way to add extremely appropriate mountains, provide a spectacular view, and not expand beyond one sim to do so. This might be a consideration for border areas.
Yrs.,
Klaus Wulfenbach, Baron
Consulate of Europa Wulfenbach