So we went directly to Lowe’s, who provided a receipt for microwave, installation, taxes, etc. totaling about $530.

I would ask the installer to come back and fix it.

You were upfront about there being no vent and needing to use a ventless option, so you don't have to install that for them or even split it, but splitting it probably is somewhat fair. 

Typically you can get a window egress installed for $3k-5k.Not aware of a Metro Detroit city that will allow the conversion of a SFR to 2-4 units in an R1 zoned area.- You can improve your search by only looking in R2+ zoned areas.- Will still be challenging to acquire a SFR at a low enough price to justify the cost of any conversion.Regarding Michigan property taxes, we have a one-page explanation document we'll share if you DM us. - The challenge in Detroit is that the city is "deliberately" keeping SEVs low to not scare investors away over property tax increases.

Are you installing new smoke alarms?

My neighbor did this during one those programs (had a 2 family, made into a legal 3 family by converting the basement) but, among other things, he had to install a fire suppression system in the basement, expand windows for egress/ingress purposes, and do a whole bunch of other things.

This means that your accountant can report your exchange as a partial exchange and partial installment sale with proceeds received in 2025.

I've used Lifeproof from Home Depot, it was a little bit harder to install due to it's rigidity and thickness but it's extremely durable and easy to clean.

Easy to install and quick.

By the time you spend the labor on re-facing, you can often demo, and install new cabinets for about the same amount of money.