Since you are already familiar with house hacking, I would consider converting your current home into a rent-by-room or whatever it takes to keep it as a long-term rental, then look for another home you can hack.

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

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

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).

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).

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

You could also offer to cover part of their tax liability through negotiation or encourage them to convert the property into their primary residence to use the IRS exclusion for up to $250K/$500K in gains.

This is one of my old homes, nothing of a house, the garage was converted to a MB, it sold in like 3 days cash, INSANE price.  

You can convert the property to MF after acquiring it though.

Can anyone recommend a company that offers a builders risk policy to cover the construction period but then will also allow a cancellation and refund after work is finished to convert into a standard landlord policy.