Thanks everyone for the detailed and thoughtful replies; much appreciated! I have quite a handful of comments and questions in response:
1. It's interesting to hear peoples' thoughts on using cap rate when analyzing residential properties. The inconsistence of opinions on this is consistent with what I've found elsewhere :). In general, everyone agrees you should use cap rate for commercial, perhaps half say to use it on a 4-plex, a quarter say to use it on a duplex, and a small handful say to use it on a SFH. Really interesting to hear how different people think about this!
2. Really interesting points on how owner-occupied affects the analysis between a significantly reduced loan rate and a negative cash flow justification. I hadn't really considered this because I'm not really considering owner-occupied scenarios for my own investing.
3. I didn't know about rent-o-meter.com - seems like a useful resource when starting research into a market or sub-market! Thanks for sharing!
4. The 1% rule and 50% rule seem like interesting and useful rules of thumb for doing an initial analysis without a calculator. Seems interesting also to note that you can directly relate this to cap rate (perhaps to allow for a more apples-to-apples comparison of a residential investment and a commercial investment). Specifically:
value = rent / 0.01 (estimated via the 1% rule)
NOI = 12 * rent * 0.5 (estimated via the 50% rule)
cap rate = NOI / value = (12 * rent * 0.5) / (rent / 0.01) = 12 * 0.5 / (1 / 0.01) = 6 * 0.01 = 0.06
In other words, combining the 1% rule and the 50% rule is the mathematically the same as assuming a 6% cap rate for residential. Does that sound right?
5. I appreciate the thoughts on potential hidden value. I suppose with enough experience and actually looking at the property, this is something a potential investor could identify.
6. Regarding cash flow being number one priority, that makes sense, but even with good cash flow, overpaying seems risky as it would "lock you in" to the property (it'd be hard to turn around and sell it if you needed to). It also seems like it'd make it a lot harder to get a loan, unless the property actually appraises at the seemingly inflated price. Would you agree?
Thanks again everyone for the replies to this question. Really really helpful as I try to educate myself!
Ryan