Your waiter brings you a check for $200 that includes:- $50 for appetizers- $100 for main courses- $50 for drinksThen she realizes - oops, sorry, I did not include part of your order, let me bring you a revised check.

Check also to see how badly the property may have flooded in the past and how often. 

With a Special Warranty deed they can only hold you accountable for title issues that happened during your ownership of the property.

I'll check out some of the other products you mentioned.  

I think that it's pretty common that contract for deed is low downpayment, no credit check, and that owner financing is higher downpayment, more vetting of the buyer.

But to not take into account your current lease and provide some level of credit for it, that seems odd.  

Above 5+ units is possible but more challenging and rates are where you would expect them..50-65%LTV will be common for higher plex units, a common workarounds is if they have a US based family member or business partner with an LLC..Some investors or lenders have specific countries of origin that are restricted or even prohibited, check with your mortgage professional. 

If you have to save some $ somewhere: Get some exact measurements and go find a used , surplus, scratch and dent, fb marketplace, etc -- tub that fits (double tripple checking specs), for your contractor to install.

I recommend you check out the Ohio markets.

Check meetup.com or search Facebook for real estate investment groups, clubs, or meetings in your area.