My challenge is that I don't know when exactly I will be able to obtain the STR permit from the city, so I don't want to convert guests too prematurely. 

It's also unlikely that you can convert a single-family home into a community center (not sure if you mean an actual community center or co-living space).

query=garage#sear...If you can rent a 2 garage at $450 without spending ~$150k for a garage ADU conversion, no work/risk of the ADU conversion, the lower maintenance/capex, easier eviction, no rent control, less tenant interaction, it will not convert your SFR to rent control, etc, it seems superior to the garage ADU conversion.  

I have a PO Box that i used for that purpose and any other business mail but since converting to ACH i am not sure when its the last time I went by the post office.  

This is a SFH that was converted to four units a long time ago.  

My original SFR was 1100sf and I added 2 units: an 800sf SB9 unit and a 750sf ADU (converted garage plus addition).

What is the realty of converting a new Warehouse build into apartment spaces?

Duplex Development Made Easy - SB 9 permits property owners to convert single-family lots into duplexes.

All the rest can be subbed out unless you are doing a full remodel by adding square footage to the house/converting a space (bath/bed etc).

Or, in Providence, RI they took the oldest indoor "mall" (Arcade) and converted the second and third floors to apartments.