Yes, it is true Android runs across a wider spectrum of hardware devices and, consequently, Android apps, need be aware of the platform on which they are running and adjust themselves (display size, networking options, specific hardware devices{GPS, NFC} etc) accordingly.Despite the fact iOS runs on a much smaller, more uniform, set of hardware devices, good development practice would see the same platform awareness measures taken.Fortunately for you, unless you have a specialized need, there are library APIs on both platforms which assist your app to adjust itself to the platform on which is it running.I will admit, I have not played with the BP iOS app to see how it was implemented, but I cannot imagine it requiring anything out of the routine (i.e no special hardware or low-level access required).

None of it can be lower than 5'.Ok, so after reading what you wrote, and reading here, (http://www.ncrec.gov/bulletin/vol29-4bulletin/squarefootage.htm) they only count areas that are 5 feet in height and above, as long as 50%+ is over 7 feet, regardless if my knee walls are at 3-4 feet, anything below 5 does not matter.According to my measurements, my attic would have an interior finished height of 8 feet at the peak.

Get yourself a laser measuring too and draw the floorplan as you tour.

The two most important ones being IRR and Cash on Cash.IRR (Internal Rate of Return) is the measure of the return OF capital and return ON capital over the life of the investment.

Since cap rate is a function of net operating income over price, the higher price you pay, the lower your return relative to the purchase price.You have to be careful with all of these measures, however.

Am I aiming too low?  

Charging for something in real estate dealings that has no measurable value is predatory dealing.

What cap rate are you aiming for?

First, unless you took the measurements yourself, advertised and/or tax record square footage numbers are notoriously inaccurate.  

(ok, I'm exaggerating a bit) but you get the point...The reason this is wrong on so many levels is that they aim for the heart.