Each building is unique with different mechanical characteristics, if you're doing a full rehab it may be easier to start with $300/unit. 

The place is unique because it allows nightly/short-term rentals, which most condos here do not allow.

Controlling properties that are not legally yours does have some unique advantages. 

I almost feel that appraisals for 2-4 units are something that always will be trouble cause its so unique.

., what a unique opportunity!  

Right now I am looking at an Owner Carry situation so I am worried the Owner may do something if I turn the property into something else and want to repay a Lender with equity gained from value of property built.

There are ways around that when it happens - basically compare some apartments that you are familiar with, against the county data, and find criteria that is unique to those properties that you can use to find all of them.

I have an 85% loan to value on it and can use all the equity up to 85% of its appraised value with a Key Bank.One would say that’s crazy why pay all that interest, well there is a unique method I use to pay off my mortgage my simply deposit all my pay into the HELOC pushing the principle down on a daily basis.

Do they have their own set of unique challenges, sure.

Student loan debt, for instance, has a variety of benefits that include an income-driven repayment option.