Intel is a great example, who is building the largest chip manufacturing plant in the US right here, and it will be a $20 billion dollar investment that brings a few new thousand jobs.https://www.dispatch.com/story/business/2022/01/21/intel-ohio-building-computer-chip-factories-licking-county-jersey-township/9173472002/ Another example of economic growth is the upcoming Ohio State University Wexner Medical Center Inpatient Hospital which is a 1.9million square foot hospital that will bring over 800 new beds and a thousand new jobs. https://abc6onyourside.com/news/local/new-osu-hospital-expected-to-transform-health-careHere are a few more recent investments https://www.10tv.com/article/money/business/hydrogen-power-company-hyperion-bringing-700-jobs-to-columbus/530-25907aab-5517-4661-a9f3-d2ed2d5be6b0 https://news.wosu.org/news/2022-02-08/rumpke-to-build-50-million-recycling-facility-in-columbus Check out The Complete Guide to the Columbus, Ohio Real Estate Market which goes through the Columbus, Ohio market in depth and will give you a better scope of where the highest levels of growth are taking place and where to look to invest.

You could end up spending $20 a square foot or more.

The only time we let a tenant use a CC is if they are moving from out of town and don't have any good way to make a cash deposit at our bank, and then we have a Square account that we add the appropriate fees to and it only goes one way (into my account). 3.

Not sure what the rates are, but $1-2 a foot for a tin can warehouse has very upkeep.  

*An ADU with a gross floor area of 800 square feet shall be permitted on a premises with an existing or proposed dwelling unit regardless of maximum lot coverage, maximum floor area ratio, and minimum open space requirements The development shall comply with the floor area ratio of the underlying base zone unless the development incorporates an existing structure that exceeds the allowable floor area ratio or is under the allowable floor area ratio by less than 800 square feet, in which case an ADU that does not exceed 800 square feet shall be permitted.So there is FAR relief if you have an existing building that already used all of the available FAR, or is within 800 SF of the maximum FAR.

I am going drive down to a few cities later this month.I lived in Journal Square, NJ and Rutherford , for a couple of months.

I considered separately costs for structure, decking, railing, and other; comparing wood and trex.Structure costs include post footings, posts, beams, joists, stair stringers, all hangars/screws/nails (except the special deck brackets fasteners I included with decking).

Meaning this: the old cabinets might have already made the adjustments for pipes, out of plumb/square walls, heating ducts, whatever.

I like wood or some kind of engineered wood also but I'm afraid if i put that on the upstairs your going to hear every foot step above thought the ceiling 

If you are given a free estimate there is probably a reason for it: contractor is out of work and needs the business, he is a new contractor trying to get his foot in the door, etc.