Consider adding motion-detecting floodlights and installing visible CCTV cameras around entry points to deter crime.

And a little skepticism that the market would continue to grow at 5% or more on average (it's been ~7% average for the 8 years I've lived here)@Dave Foster I filled out the BP spreadsheet here for the sell or rent decision, and similar to you advice, selling and investing the profits in index funds performs only slightly below being a DIY landlord, making that seem an attractive option. 

Consider an Installment Sale: By structuring the sale to receive payments over multiple years, you can spread the capital gains tax liability over time, potentially keeping you in a lower tax bracket each year.11.

Screwing a 4x4 screen into a roof would probably not show up as an "installation". 

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.

I went to Federa's website and found SmartBuy DIY where I did by myself every process from start to finish.

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

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.

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.