Are these Class C zip codes?  

If you’re talking C properties probably cash flow.

@Anthony Sigala that "Rule" was created for mostly Class B properties BEFORE the Great RE Crash of 2008-2010.Values after the Crash dropped so much, that it could also be used for Class A rentals.Values are now more than their pre-crash highs, so the rule now only applies to Class B & C rentals.How are you identifying Class B & C submarkets in your area, so you can properly apply the rule to the right rentals?

(A,B,C, D areas)? 

This is the simplest method, but it also means your tenants are more likely to abuse the utilities by leaving windows open with the heat or A/C running, leaving lights on, ignoring the toilet that constantly flushes on its own, etc.3.

Is it class A/B/C, B+ or B-? 

@Andrew C.

(For context, it's a 2700 sf 4 bd 3 bath house in an upscale Northern California suburb.)Kitchen A: Traditional, features a 48 in fridge, 36 in cooktop, window sink (no view), pantry.Kitchen B: Designer, features a 60 in fridge, 48 in range, large kitchen window (no view), sink facing living/dining room; unfortunately no pantryKitchen C: A Little Bit of Both, features a 48 in fridge, 48 in range, sink facing living/dining room, pantry, unfortunately there's no window.Total countertop space is roughly the same (22 ft)  in all three layouts.

@Rory DarcyRecommend you first figure out the property Class you want to invest in, THEN figure out the corresponding location to invest in.Property Class will typically dictate the Class of tenant you get, which greatly IMPACTS rental income stability and property maintenance/damage by tenants.If you apply Class A assumptions to a Class B or C purchase, your expectations won’t be met and it may be a financial disaster.If you buy/renovate a property in Class D area to Class A standards, what quality of tenant will you get?

Otherwise, any SFR will probably need a fair amount of rehab and/or be located in C/D neighborhoods.