The mill tenants pay electric and heat and have an elevator and view of river.

Not recently, but this happened to me twice back in 2010ish when appraisers were getting a lot of heat for their appraisals back in the early 2000's.What I did several times, we have my own appraisal done first.

Whatever is used to heat/cool the house (E.g. electricity) should have square footage factored in.

The average temperature is 50 below zero, or so it seems, so basement offices would be relatively cheap to heat in winter, which is definitely important.

The HVAC contractor started on the heating system on Monday.

That fixed price is based on the size of the inverter, not on the actual output.It made sense for us because we have electric baseboard heat, which is only slightly less expensive than burning actual dollar bills for heat.We have a net meter, which spins backward for most of the year, meaning that we build up a negative balance all spring, summer and fall. 

“Basements” don’t have to be “below grade”.In the front elevation, is the area to the left, opposite end from garage, Finished with ac/heat, or not?

The issue I'm facing at the moment is that there is no gas to the house - everything is electric, including heat and hot water.

ExamplesClosing costs to purchasepoints on any mortgage to purchasetitle fees and title insurancelegal feessurveymisc junk feeslender fees appraisalcarrying costs like interest, taxes, heat and cooling, Builders risk insuranceDraw inspections on construction loansCosts to sell sellers concessionstransfer and recording taxesreal estate agent commissionsstagingphotossellers side closing costsThese items can easily be 15% or even 20% of the deal.

Some were pretty bad like AC/heating or major appliances broken for a prolonged time.We knew this PM was not top notch (he is always behind in forwarding the rents, almost never provided statements so we have been kept in dark regarding repair works or eviction), but we had no idea he was also being negligent toward the tenant.