I would bet the house has high humidity or condensation on the windows.

Possible condensation site?

Short of giving me the next edition of your book @Dawn Anastasi I'd be extremely interested to hear the condensed version here and now?

Frozen pipes, crappy AC, condensation, leaky basement, etc, etc.

We have four lots located on a corner which I had condensed to two lots so we didn’t have to pay for four lots to the mandated community center.

Just a quick note about failed windows that have acquired condensation between the frames (more common on vinyl and other windows that don't have a visible metal spacer between the frames).

The condensate drain and trap need to be cleaned, and the water replaced in the trap.The blower wheel needs to be checked for debris and cleaned if necessary (this requires complete removal of the blower wheel).An amp-draw test should be conducted on the blower motor and compared with what is listed.The wiring needs to be checked for corrosion and damage.The filters need to be checked

I'm attaching a picture of the electrical wires I have available: 2 wires for condenser units and 1 wire for HVAC.

Mini condenser systems or something?

Old windows probably won't be a big draw or something a long term tenant wants to deal with, once they have condensation and mold from the moisture.