I've found the product to truthfully be better than an Anderson 100 series window and while I've been fortunate not to have any maintenance issues thus far, my supplier who I've worked with for a few years and trust has made a point of emphasis in saying their warranty response is excellent.

You should be able to tell a lot in less than an hour.

A dozen properties takes less than an hour per month. 

Means, they draw significantly less electricity to cool or heat than an electric-powered HVAC unit. 

i'd call a bunch more lenders and at least have one more appraisal done unless you truly feel you've exhausted the refinance path.

A new construction loan Might be more difficult to qualify for than an existing structure loan.

It protects it from outside liability (let's say you drive recklessly and kill someone, and your personal car insurance gets exhausted, the suing parties cannot come after the rental property because it is not personally owned by you). 

I think a more appropriate question to get a better quote1) Instead of doors, it should be properties.If you are okay with tracking by the overall property.If you also want further tracking by unit, it would be more work and likely a larger bill.2) How many Accounts do you have(Bank Accounts, Credit Cards and mortgages)3) How many transactions do you have per account, 50 transactions will take more time/work than an 5 monthly transactions.

I truthfully don't see a great deal of negotiation leverage as this building is the norm  rather than an outlier fact pattern.

The cash flow to LL using PM for STR is not substantially different after including extra expenses than an LTR.