Multi-Family that doesn't cash flow

[Luke F.]

I was running numbers on local properties in Denver (yes, the market is pretty hot, especially on loopnet) and there was a duplex in the 500k range.  The numbers were roughly $2,500 for rents.  Even if you put 20% down, the mortgage would be in the range of $2,300.  My question is why would someone buy this?  Outside of the $2,300, you have Insurance, tax, cap ex, management if need be, etc.  When would this make sense?