Purchase price: $275,000 Cash invested: $294,000 Sale price: $355,000 The property is a 2 bed 2 bath with a den and a 1 car garage.

Purchase price: $15,000 Cash invested: $25,000 Sub to deal - paid the seller and wholesaler $15,000 + $7500 closing costs to assume $84,000 mortgage with a monthly PITI of $575.

This will be a straight up listed property and a purchase just to see the process on a Commercial/Industrial property. 

You can find some 2 units under or around $250K but they have been sitting on the market for over 150 days which tells you its not a great deal if it were an investor woud have already purchased it 4 month ago.  

In Dallas, investors are regularly getting deals around 70% to 74% (that is the purchase + rehab / ARV).

I purchased a single family to rent out the rooms and it sent my finical plan completely off course because I was not as ready as I previously thought.

If you're looking at a debt service loan, 15% is the minimum for a purchase but it's much more common (and rates are better) at 20-25%. 

I just purchased my first duplex (only SFHs in my portfolio so far) and it doesn't have the gas/water split.

My question is: After I build the units, can I do a cash-out refi and use the equity to purchase another home? 

I invest in an A/B area with an average purchase price of $500k.