I forgot this....when I use the points towards booking travel, they multiply 1.5, so I get 4.5% of dining/ travel back towards more travel.

Gain is allocated to nonqualified use by multiplying it by a fraction, with the aggregate periods of nonqualified use as the numerator and the total period the taxpayer owned the property as the denominator.

To determine the assessed value for year 2, simply multiply 6% to previous assessed value plus previous assessed value ($6,000 x 6% + $6,000 = $6,360). 

However, just the cash flow on these properties, should make little baby properties, which will continue to multiply over the next 20 years into a colony of properties, thus achieving my goals..  

Yeah, expenses don't work by way of just multiplying some artificially low number by some arbitrary multiplier.

I've read several different places that $30-35/sqft is a good starting point for a gut job flip and $20/sqft is a good approximation for a moderate flip where some systems (roof or ac) are ok, so depending on condition, I'll multiply either $35 or $20 x (2/1 house sqft) and then add $50,000. 

(they measured the footprint of the buildings, determined roof square feet and then multiplied x the "going rate" to arrive at a price. 

You're creating inventory that multiplies NOI. 

The taxing authority will have all of the various taxes published on their website(such as county, hospital, school districts and many others), you just add them up for the ones what apply to that property and multiply it by the sale price.

The cost per square foot to develop shouldn't change that much from a single family for a duplex... you just have to look at what the cost per square foot is and multiply it by how many square feet you're building.