This would bring my numbers as follows:Monthly Rent - 1500Principal and interest - 693Taxes - 1850 yr (154 month) estimating conservatively Insurance - 1200 yr (100 month) also an estimateCapex - 150 month Maintenance - 150 monthVacancy - 120 month (8%)No property management due the self managingTenants are responsible for all utilities (separate meters for electricity, gas and water.  

We are working with wholesalers who are bringing us deals at 80ARV of their estimate on what the property would be worth.  

Scott The Book on Flipping Houses, The Book on Estimating ReHab Costs http://www.biggerpockets.com/flippingbookConsider checking out HUD homes for small multi's owner occupied gets first crack.Download BP’s newest book here some good due diligence in Chapter 10.

How do I estimate demand, occupancy rates, and rental rates for a property/area?

He has 25 years in construction & does quick repair estimates for another female investor here in town.

It is my first deal, i want to make sure that I am not forgetting anything or I am under estimating the cost associating with it.Not to forget that I will be living in the third unit as well and the income is only counting two rented units and not counting my unit.What are your thought?

CMA from my realtor estimates the value to be at $330-$340K, monthly rent at $1400 per month.

Scott The Book on Flipping Houses, The Book on Estimating ReHab Costs http://www.biggerpockets.com/flippingbookYou might consider Niche or Specialized Housing like student housing.

Research: estimated appreciation for your property, realistic expected return on the potential new investment, local inflation, growth...3). 

Scott The Book on Flipping Houses, The Book on Estimating ReHab Costs http://www.biggerpockets.com/flippingbookConsider checking out HUD homes for small multi's owner occupied gets first crack.Download BP’s newest book here some good due diligence in Chapter 10.