Occupancy limit on studio loft

[Kumiko Schlosser]

Hello. We are new landlord and want to have clear understanding on regulations on occupancy limit. We have studio loft apartment units. It is 530 sqft with metal hand rails with metal spiral stair case. We think it is ideal for one person.

We understand that we need to allow two people per bedroom with familiar status. (does it mean a parent and a child (2 people) ? or parents (2 people) with a child or children (not to discriminate number of children??) 

Since they are not familiar status, if a boyfriend and a girlfriend apply for the unit, do we have to allow a couple to live? or can we say it is too many occupancy?? 

Also, we have an enquiry from a mom with 3 year old.  We can not descriminate them; however, a toddler living in an open loft with metal handrail and metal spiral stairs with wide gaps may not be safe...  We can not direct them not to live there but what can we do?

Appreciate for your input. Thank you.