Is it true that even if one owns the entire multiplex, they can only STR if they occupy one of the units?

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Do it with as much time as possible. 

You just enter the tenants info and then we automate the entire process of setting up the correct bank account, sending receipts, paying interest, and closing the deposit at the end of the lease.

We aim for 100% occupancy, which is possible in theory if you exclude properties that go through a scheduled rehab.

Yes for sure possible upto 80% on a 30 year fixed if rent covers the mortgage . 

Smart people - if I own 24 buildable lots appraised ~$1.6-1.8 million in total (assessed by town at $1.4M), what do you think is the best way to build out the homes (notionally $300-400K builds/$450-550K sells) and make money: a) putting the least money out of pocket into project, and b) NOT signing on construction loan(s) if possible? 

So you could possibly play it safe and send it to their atty directly. 

That's not possible...If you signed a contract for $100k, that's the price 'until and unless' there are changes requested by you OR required by circumstances (in-wall wiring is frayed. headers are undersized, etc)Second - Please don't breakdown the materials and buy them yourself.

With this ruling there's possibility for buyer to contact seller agent  and deal directly.