It really depends on the market, an investors goals, and their individual situation if an investors would switch to multifamily. 

These loans don't require W2's, paystubs, or tax returns.

And also proof that tenants were not harassed when they left is a requirement to the conversion.

You correctly pointed out real estate investing requires liquidity/cash reserves.

This requirement applies regardless of the property's purchase date, even if acquired before the implementation of this ordinance.

Class A provides investors with more security by knowing that they are investing in top tier properties, with little or no outstanding issues requiring further capital expenditures.

My position would be to only allow the new resident if they meet your requirement but NEVER let the one moving out off of the lease until all of them are gone.

If you're worried about break-ins, then you need to secure it.We give our clients several options, including removing & storing the mechanicals to avoid theft.Also, check with your municipality to see if they have any requirements.

If this is off-market, I’d let the sellers/tenants know what you'll need access to in advance so they can move anything if required. 

It's comparing apples to oranges, you literally went from a 5-day work week to complete remote work and housing as the #1 sought after target for any individual in America.