Are there any zoning restrictions in terms of what businesses can operate there? 

The drawback you have to fit "in the box"; 20% down +, excessive reserves requirement, specific restrictions on tradelines, assets guidelines, DTI under 43%, owner occupancy etc.. if you are open to ARMs you will have a bit more options..Also need to consider the type of property - if condo/condotel banks might not finance at all.. there are many factors to consider we do have some good outlets for jumbo, would be happy to review your scenario and give you a quote.

Too few details to answer (Of course this varies county by county, all questions could be answered by reading the (zoning)/building code and/or clarified with a visit to the county planning office).but some clarifications because: lots of things are "tiny homes" but what you describe small houses "on permanent foundations" needs to be clarified , tiny homes could be:-stick built, see below. check your county code/planning dept-stick built cabins/recreational, a specific zoning and potential occupancy/etc restrictions but worth looking into where the zoning allows for it -hud manufactured homes (smaller singlewide perhaps 400sq ft 600sq ft minimum)-non-hud park models (on axles), ansi standards- other "RV's" built on a chassis:  organizations, state agencies, etc - will certify factory built (or sometimes inspected professional built) tiny homes on chassis - to whatever standards ansi, riva, dot/ l&i?

Yes, on the part of the lender, they can do whatever they want, However, an individual's debt can not be imposed upon another individual.

I know some markets like Traverse City and Charlevoix are imposing STR ordinances to control the number of rental properties which is a bit concerning.

I was afraid and called local fire station and they didn’t do anything and then I called insurance they suggested to get help of any water restriction and insurance will take care.

Of course, make sure you research whether there are restrictions.

The same issue, anytime I post a marketplace ad for one of my rentals Facebook restricts my marketplace access.

The problem is that this plan has high restriction on "actions" preformed by globfiflow (5000/month - action is creating a single variable....).

I have my contractor walk through it instead of a home inspection.Once you do a few, you learn to expect pipe bursts and leaks, sewer backups, etc so just factor those into your rehab estimate.The big question if you are looking to wholesale is -(a) I believe HUD has a restriction on the deed saying you cannot flip/wholesale it.