New 30 Year roof installed in 2022.

I never stain fenced when installing new ones in rentals.

Find out which filters are best for your furnace, purchase a year's worth, write the installation date on each one so the tenant knows when to swap them, and inspect regularly to verify it's happening.

The best thing you can do to prevent future foundation issues is installing gutters around the property to repel away from the foundation.

Install landscaping that super low maintenance and reduces water usage and looks nice.

(FWIW,$8K on just the compressor seem excessive.)Otherwise, unless your contract with your GC says they will provide 24/7 surveillance, or you can prove the AC was never installed, you own the problem.If the property has been vacant for more than 30 days, most policies won't cover vandalism unless you have added a Builders Risk Addendum.

We also have installed SimpliSafe (and signs about ongoing monitoring outside of the property).As someone else mentioned, it is best to have a plan not to go long stretches without checking in person.

We get granite for around $40/ft installed from a local shop. 

My thought is to structure a deal where we borrow her parents equity from them and pay them in monthly installments once we get the apartments rented.

If it costs $100,000 to install an ADU and it rents for $1,000 a month, then it may be worth it.