I would say that being in a security building does add value, both in pure monetary terms and also in sales and rental marketability.
If a locked foyer door keeps the people selling religion and various other wares out, then that alone makes it worth the money in most people's books, and a properly designed system with a buzzer that sounds when the door is propped open, combined with a proactive committee that communicates regularly to residents the importance of and means to ensure good basic security (close the door, don't let strangers in) will be extremely effective in keeping the seriously undesirable out of your hallways.
Put a few cameras around the place, and you've basically put your building in the “too hard” basket for most theives. They'll go and target Gikku's building next door, because it's so much easier and less risky.