Have owned properties as old as year 1840, and 1870, 1890; they're not built to any code, sometimes built by owners with limited skills, sometimes built before indoor plumbing ( easy way to tell the only bath is on the first floor next to the kitchen and no baths on second floor where there are bedrooms. 

Code enforcement officers walked my 5 bedroom 3 bath home with me and told me my tenants have 90 days to vacate.

Quote from @Ian Hutton: @Joe VilleneuveI agree actually that zip codes can be misleading in terms of a neighborhood by neighborhood basis.

I would call your local Public Housing Authority, ask for a sheet of how much they are paying for what zip codes, and then focus on finding good deals within those zip codes.

My project was 5 years along and didn’t comply with fire code and it’s been dead ever since.

By definition all 44 contractor classifications have passed the state exam and adhere to the laws of the CSLB & Consumer affairs.Any handyman performing work over $1000 is in violation of Business & Professions code 7028.1Any handyman performing work over $1k is subject to forfeiture of the entire sum of "contracted" work B&P code 7031(b)All California home improvement contracts must be a quoted upfront price including labor, materials, warranty etc.

I would call your local Public Housing Authority, ask for a sheet of how much they are paying for what zip codes, and then focus on finding good deals within those zip codes.

If a single-family has a basement that could be converted, I’d only move forward if it can be a legal, code-compliant second unit - egress, fire separation, ceiling height, parking, permits, the whole nine.

@Chris Mclaughlin  Nationally HUD determines the "Fair Market Rent", which is the Median rent and is broken down by either zip code or for the whole county. 

I’ve been looking into setting up a RUBS system — probably billing tenants back for about 75% of the total monthly water/sewer bill, divided equally among all occupied units.I’ve read that some cities in Ohio (like Cleveland) prohibit or discourage RUBS, but I haven’t been able to find anything specific in the Euclid municipal code.