. >> reporter: nestor vasquez is a private security guard for the nearby federal building. he says the later it gets, the more busy and dangerous things become. >> so many people you cannot even walk. deposit is filled, ss pd and also to try to do what we can. >> reporter: vasquez says many of the people buying and selling drugs will also go inside plaza next deli, the business opened five months ago and has become very popular because of its 24 hour availability. the mayor's office says these late-night stores may be unintentionally contributing to the drug markets. >> you know, it's is what it is. >> reporter: with the store owner, he did not want his face on camera says it is not their fault. >> blaming businesses for being open, but i think that is the issue. the homelessness has been going on in san francisco for more than 10 or 15 years. >> reporter: he says most people at that time were just coming in for cereal and milk and they need to stay open. >> renton seven cisco goes so high, owners cannot afford to pay rent, and employees of the shutdown early. they won't be