I currently own my personal residence out right, valued at an estimated 330k and I'd like to do a cash out refinance mortgage at 80% LTV.  

expect to cashflow $150/month with capex estimated at 15% and 5% vacancy

Search "Comparable Properties" for estimated ARVs/Values.

2) Estimated value is $220,000-$230,000.

(that all gets divided up into different categories.)The "passive income" that results from a rental does not require paying SE taxes but you do need to pay estimated taxes on the predicted income or have your employer withhold more if you have a W2 job.

I've sent a couple of possible draft plans to Abdel to get rough estimates but would like to check around with other builders also.

What makes it even better is that my refi estimate and expected ARV came in almost perfect when it was all said and done.

I would estimate over 15 years old.

Big ticket items like insurance is one area where you can get big savings.I just got my escrow estimate for one of my rentals and the insurance went up by $200! 

I’ve had a single family home appraise for $20,000 less than a zestimate and another appraise for nearly $20,000 more.I’d recommend talking to a realtor who can pull comps and give you a much more accurate estimate of what value of the property.