It also has a 1 room plus bathroom contractor type office attached to a garage.This is a pure residential area, but besides doing STR with the ADU, what might some ideas for the garage office?

I don't know what your post said, and you may think it was "funny as hell", but I will tell you that people who think they are witty and clever with their provocative posts generate almost as many complaints and degenerative posts as pure spammers.

When able to rent both sides for full market value pure cash flow should be between $200-$300, but goal is to pay off loans and hold LTR investments as part of retirement plan.

Is 5400 pure cash flow or revenue?

Then any rehab you have those cost, they add up quick from light bulbs and batteries to water heaters and air conditioners.Once you get a tenant in it they will find things that don't work that you missed because nobody has been living there get ready for a few calls to sort things out if its been awhile since anyone lived there. 

After reading reports of serious, damaging fires caused by electric car batteries, I'm considering disqualifying potential tenants who have electric cars and putting a clause in my lease prohibiting electric cars and stating that the tenant expressly assumes all risk of damage to the property arising from electric car fires.

I've gotten cars running that sat for much longer periods of time than that and a new battery and fresh fuel got them running.

Purchase price: $130,000 Cash invested: $43,000 Goal with the first OOS rental was to find a SFR that was primarily rent ready or required light rehab by Summer of 2021, with the criteria minimums of $200 pure cash flow, 10% CoC return, purchase price around the $125k range that met the 1% rule.Backstory:This property was listed on the local MLS as "coming soon" and I reached out to the listing agent directly to see if they were entertaining early offers.

My criteria minimums were $200 pure cash flow, 10% CoC return and purchase price around the $125k range that met the 1% rule.

Pure cash flow.