They will let you know what you can and can't do without a permit and what you are able to do yourself within the scopes of those permits.My concern is because this is a rental, if you do anything that is not to code and the tenant reports it, you will likely have some much bigger issues to deal with.Given you note this is major rehab, I tend to lean to hire most, if not all, out. 

Bananas and coconuts have similar disease issues.2.  

If you are deadset on refinancing into a conventional loan, then you will likely run into seasoning issues.

I plan to purchase a primary residence, multi-family home (2-5 units, 'house-hack'). 

And to answer your question, yes, DTI issues are usually why investors start using DSCR loans. 

It would be wise to rectify it before transfer of title so your starting off clean and hopefully won't have any issues when you go to sell down the road. 

Yes I assess I flat fee of $50 - $75 per month for tenants in multi family units in Cleveland. 

(Ensure no trespassing/squatters/maintenance issues.

I say to look at these hard because these items can occur for a period of 12 months possibly without major issues of seeing large cracks or settling if a lot of water hasn't been present in large volumes.

This is less of an issue here that what you all are describing.