Its a 3 unit row-house built 1900, pretty good condition, newer roof and water heaters, not sure of other stuff.

I have rehabbed about 2 dozen units which I consider a fair amount of experience.  

Does anyone have any recommendations for financing a property that consists of a single family home, a self storage unit and a manufactured home?

Yes, I've reported to bad check unit, but not sure that there's going to be any success in getting money back from that.

I bought it for 410K and I'm currently listing it for 720K, and i was informed that I would be taxed around 50K since I only lived in 1 unit for 3 years.

Investment Info:Small multi-family (2-4 units) buy & hold investment.

Furthermore, you may be able to purchase commercial rental units (5+ units) where you may be able to cash flow even more. 

There are any number of reasons a person would be traveling and looking for furnished housing.

Are there retail units also?

Since you'll be living in one of the units, you can qualify for owner-occupied loans, which often have lower down payment requirements and interest rates compared to traditional investment loans​