It'll either work or it won't, and either way (assuming you've done your homework) you'll be OK.

Maybe partners would be helpful to stretch your capital, if sharing the returns works out in the math.  

This is really simple math, the area that has the greater rent appreciation will always eventually produce the better cash flow (assuming the rent appreciates more than expenses which is almost a certainty if financed with fixed rate loan and the near fixed property tax of CA due to prop 13). 

I bought a land at Tax Sale Auction thinking I was buying a house for 18.5k, really soon after the Auction I was embarrass for my poor Due diligence, took me a while to overcome the feeling.Year and half later I took the decision to sell, and finally a buyer 11 months after law ball me and I accepted 18k, just to take my inicial investment, but this time title company told me Is a Labor Lien for 14.5k dated from 1985 (the land used to be City’s property).According to my math, if I decide to go through I’ll be loosing all my money, because I paid back taxes and current. 

You determine what the rents are or what they should be, do the math for the cash on cash ROI that you want and that’s the value.  

I get it, we read bigger pockets posts about people getting 250-300 a door and you do the math, if I have 10 rentals at 300 a door, I can basically quit my job or scale back at work.

Is the math incorrect?

I think you misunderstand the math.

He can give you a bid.then you do the math.

I competed in math competition too.Bravo boys.