Now what i am looking at doing is taking out a 30 year mortgage on my house for $150,000 If i can achieve a 4% or under interest That would be ideal but i could go higher if needed.

This is a very simple house with a simple AC unit, and the indoor unit is about 15 feet from the outdoor unit.

If you want $150/unit I think that's your answer.Give yourself real numbers like you've now done on expenses and work backwards to your offer price that will net you $150/unit.  

Opportunity 1 (based on full occupancy)8 unit apartment complexMonthly rent per unit is USD 800 per monthApartments are in good conditionPurchase price (including taxes) USD 170,000Loan payment for 10 years: USD 2,293Opportunity 2 (based on full occupancy)10 unit apartment complexMonthly rent per unit is USD 1,000 per month for two full sizeMonthly rent per unit is USD 800 per month for eight studio typeApartments are in good conditionPurchase price (including taxes) USD 515,000Loan payment for 10 years: USD 6,247

Do you see 5% a year in appreciation to be a pretty achievable number?

It is located in a complex where only 1 other unit has sold recently, but this unit is a 2/2 with 1178 sq ft.

Not saying anything bad about it but that's just a way of life for many in that situation.So when I had my 20 unit I would see a lot of junk of constant mattresses and sofa's, old tables etc. being thrown away all the time.

684 is a good start, 720+ is a target you should strive to achieve!

Which would slightly better than triple the rent roll and expenses.The Value per unit if I wanted to sell them separately at completion would be 115K per unit.

Asking if this is realistic, is hard for anyone to answer except you, because no one actually knows your drive and your willingness to put the effort forward to achieve the results you desire."