And those are in neighborhoods with limited off street parking so they are in pretty high demand. 

I can't control what other investors are doing, but I'm not going to buy, for instance, a duplex on a street of duplexes because that's going to depress appreciation and rent increases.

It is street by street though so be careful.

A few months ago my sister who lives down the street (San Bernardino) sold her 2bed 1bath house, buyer paid 70,000 above asking. the Previous owners had added two bedrooms and a bath unpermitted.

You could hire whoever you want, with or without a license, a random person off the street, and still be covered by the WC. 

@William S. as requested  5017 N 84th Street pre/post deal analysis.

I was renovating a home across the street from where I live, and the neighbor wanted to know what was happening with it.

If Congress takes away the mortgage interest deduction to give tax cuts to the top 1%, there may be people taking to the streets.

Pick something generic like Oak Street Properties.

Parking at 459 8th St, or other garages nearby here:http://oaklandparking.spplus.com/Oakland-459-8th-Street-Parking.html