Moved to Florida seven years ago from N.J where I had a layout in the basement. Living in Florida without a basement does pose a "where shall I build my layout" problem. Fortunately, we do have a spare bedroom which has become my train room.
It allows for a 6 x 9 lower level and a 4 x 8 upper with Glenn Snyder shelves on three walls. Would like to have more room but I am fortunate to have the space and a wonderful wife that allows me to enjoy my hobby.