There's a security issue as well: Most buildings base their security on the idea that only tenants, or limited guests of tenants, will be allowed through the fr

There's a security issue as well: Most buildings base their security on the idea that only tenants, or limited guests of tenants, will be allowed through the front door and into the complex. If the next door apartment starts renting to a different person each night, the security (perceived or not) that you once had inside your building or complex has been compromised. Also, having an apartment on your floor that's being rented out often means the social norms associated with close neighbors aren't respected in terms of noise, etc.