"Interior," particularly in this context, is just related to anything in the house or building. For example, "interior design" is the choice of furniture and paint used in a house.
Someone might disagree with me, but I tend to think of "interior" as being a relatively temporary thing. That is, I don't view the layout of a house to be its "interior," although strictly speaking I suppose it could be. But again, I tend to relate it with things like furniture, artwork, paint, wallpaper, etc.
Where did you get the part you quoted from? If you wrote that yourself, I would pick a different word than "interior" to refer to the number of stories and the fact that it's a gated community. If it was from an English-speaking real estate company, I would be surprised upon reading it. That's definitely not what interior means, no matter how loosely you take it. You could get away with calling "other room" (which should be plural by the way--"rooms"), "interior features." But again, I tend to associate it connotatively with more temporary aspects of the home.