On the other hand, a 300,000 square foot office in SF can probably be easily be converted to about 30,000 studios and rented out for a cool 3 billion a month.
Superficial Floor Area. Every dwelling unit and congregate residence shall have at least one room which shall have not less than 120 square feet of superficial floor area. Every room which is used for both cooking and living or both living and sleeping purposes shall have not less than 144 square feet of superficial floor area. Every room used for sleeping purposes shall have not less than 70 square feet of superficial floor area. When more than two persons occupy a room used for sleeping purposes the required superficial floor area shall be increased at the rate of 50 square feet for each occupant in excess of two. Guest rooms with cooking shall contain the combined required superficial areas of a sleeping and a kitchen, but not less than 144 square feet. Other habitable rooms shall be not less than 70 square feet.
and
Openable Window Area. In guest rooms and habitable rooms within a dwelling unit or congregate residence one-half of the required window area in all rooms and hallways shall be openable.
and
(d) Exit Corridors. Every exit corridor in all apartment houses or hotels shall be ventilated as follows:
(1) Windows Required. In an apartment house or hotel, every exit corridor shall have at least one window unless it is lighted and ventilated by a skylight, a ventilated connecting hallway, or a mechanical ventilation system pursuant to the provisions of this Section.
and
(g) Artificial Light. In every apartment house and in every hotel there shall be installed artificial light sufficient in volume to illuminate properly every exit corridor, passageway, public stairway, fire escape egress, elevator, public water closet compartment, or toilet room to prevent safety hazard.
It's difficult to turn modern office buildings (where electric lighting was assumed, 1970's+) into apartments. The reason is that most of the floor area has no access to natural light, and the utilities are buried in the core of the building. That means that you can only have long skinny single bedrooms or massive penthouse floor plans.
Older office buildings make great conversions, since natural light was a design requirement.
My math may be a little rusty, but it sounds like you want to rent out ten-square-foot apartments for $100,000 per month. That's a bit of a stretch, even for San Francisco.
