These are not self-standing houses. They are apartments that are part of an apartment building which has a doorman or a locked door to keep transients out. In

These are not self-standing houses. They are apartments that are part of an apartment building which has a doorman or a locked door to keep transients out. Incidentally, some buildings don't permit pets, for example. Why is it so hard to understand that we don't want transients in our buildings?