Even though in this instance you described you're not touching the dollars, you could have.

Purchase price: 50KARV: 100KRehab: 15KIn this instance, you'd look to acquire it at a price of say 60K (75-15)? 

So for instance, the deal with expenses from mgmt company, i did get the sale price way way down to an 8% cap but it needed $150k in flooring, a/c's, vanities, appliances etc,etc.So does conventional wisdom, ask for price reductions, or just be happy with the 8 cap and make 0$ for the first 3 years?

In other words, in some instances, tenants routinely pay late, then redeem in court (and frustrating and costly to landlords) while others are late one time, and others have told a false bill of goods and have fallen way behind.  

For instance, child support is a big one.

For instance, if you just want to reduce your monthly living expenses you may be alright accepting a deal with less cash flow vs. someone that plans on only living there for a year and then buying another one and living in that one.

For instance, payout can be tied to performance.

And did you pay market for your duplex purchase or did you find the deal off market and try to get a discount on a motivated seller for instance?

For instance, if you are buying a 1-4 unit building and you want to get a 30-year fixed rate it will most likely have to be held using your personal names. 

In Chicago for instance, in most markets my clients buy in, the FHA loan limit doesn’t get you even close to what you need to buy a four unit.