Hello,I had a tenant last winter and the heat in his unit was supplemented by the unit above him.It gets really cold down there in winter but he chose not to have free heat and sealed the vents tightly with an aluminum foil without  letting me know , I could have easily adjusted the thermostat to lower  per his needs if he had told me and supplemented my apartment above with any additional heat but he chose to seal without letting me know inspite of my warning later on and obviously it can have detrimental effect on the tubing inside the walls due to excess pressure build up.He also complained about high electricity Bill's (obviously he would incur high utility bills when he turns on his electric radiator without using the free heat he was getting) I ended up having an oversight from my end as I did not verify if sealing vent caused any damage . 

The most common reason here in elderly homes is an uneven loss of moisture content in the joists.

This does seem excessive, especially for labor only jobs.

I got a hold of the Seller’s disclosure and learned that the property had some stucco repairs done: On 6/25/2021, the Stucco Company did a Moisture Inspection Summary that reported back high levels of moisture in the walls, aged sealants, sealant separation, missing flashings, It was highly revommended that “a follow up inspection be done within 12-24 months after all repairs are compelted to ensure that the moisture levels remain within an acceptable level.

Personally, at first glance, I would not take on this project because the exterior, alone, looks like a nightmare of work and cash output and I can't see the condition of the eves, other wood trim, roof nor whether there is a basement that has moisture or water from the melting snow and maybe the basement alone needs serious work and cash to make the house is a condition where someone will purchase it from you.

If the foam is deteriorated you could cut away the expanding foam as best you can and get another can of it and refill the gap, then when it's dry cut away excess.

The contractor ended up bringing receipts at the end of the project that were $40k in excess of the $80k they had budgeted for rehab (so he said rehab cost $120k).

Now that the Sellers have moved out, we [Buyers with Agent] took pictures of damages that weren't there at closing (e.g. broken baseboard, excessive holes in walls, mold in washer, etc.). 

There are high levels of moisture near all windows and both back doors (maxed out the inspector's meter).3.

But as @Theresa Harris whatever can put excess cash in your pocket to invest with is a good job.