My guess is that it's more windows to clean (on both sides), more to cover, dictates furniture and decoration placement, more to potentially require repair, and greater risk of entry from the elements, heating/cooling loss, etc

Having more units helps mitigate vacancy losses and are generally more efficient to operate. 

Yes, you can sue them for breach of contract and potentially your losses associated with this breach.

If your P&I payment is almost 1300, and you collected 1500 for rent, at $100 for insurance, $100 for taxes, $75 for vacancy loss, and $75 for mainantence this deal cash flows negative $150 each month.

You have a couple of long-term rentals with mortgages, and they already show a net loss with the "slow" depreciation.

What part of proceeds to suspended losses offset?

In order for me to drop it to something that would be affordable to the middle of the pack I'd be looking at several hundred in loss per month.

Automatically add money to an S&P 500 ETF into your Roth at predetermined periods spread throughout the year to surf off both gains and losses.

This lets you run any report you could imagine, including a Profit & Loss by Class (property) so pretty handy.  

I received a landlord dwelling quote from Travelers for Coverage A - dwelling for $223,600 plus 25% of additional replacement cost coverage which puts the total at $279,500, plus $28k for furnishings and $70k for loss of use.I understand I wouldn’t need to purchase the land in a rebuild, but $280k seems low for a cabin worth $520k, not to mention the risk of inflation continuing to drive costs higher for building costs and labor.