Cost and Rental values for 2 story vs 3 story?

[Nicholas B.]

Wonder if someone can give some guidance on the cost per foot on a 2 vs 3 story apartment complex? If it's $100/ft to do 2 stories, does the 3rd story increase that cost or decrease it due to not needing foundation work? Location is Vegas, flat land.

What about rental values? Do 3rd floor walkup apartments carry a lower value for typical renters? I did some brief research online but not enough to come up with a definitive answer. No real view to speak of, though I'm assuming top floor has the benefit of no noise from above. Real world experience answer anyone?