When an apartment or penthouse isn’t big enough for wealthy New Yorkers, they get creative. In recent years, a number of them have combined multiple townhouses or building floors to create supersized homes, or Frankenmansions, as New York magazine’s S. Jhoanna Robledo calls them. To construct these Frankenmansions, some prospective buyers purchase multiple buildings at once, while others approach their neighbors to offer multimillion-dollar buyouts.