With no direction from an Engineer (or Architect) Contractors have no idea and will price out the scope of work they think is best even if it's not the best option. 

Another option is to put 2-3 inches of spray foam insulation then batt under that, it will assist with stopping some of the air transfer and seal it off as well.I would also check the windows in those rooms and whcih way do they face.

My opinion only 2 cases make sense for the seller 1) they have few options and this presents the best means to get out if a bad situation.  

I know of a lender that offers a 0% down, owner-occupant conventional loan that is a fantastic option for househacking.

There are so many features that make Baselane a great option for real estate investors.

Seems like my options are:1.

This reduces exit options and affects the value. 10) Small number of small units is the most expensive residential development there is.

What are my options?

I have the option of turning it into an S corporation.

That really isn't good enough in our opinion.Another option for you is if your property is in a realtively safe area, to install a wi-fi connected smart lock.