Is this part of due diligence or can i even do this?

[Mel Rosario]

I am trying to buy rental properties in certain areas of California. Some of them have signs and some don't. I would like to ask the tenants what recent work has been done to the house, what they are actually paying, and anything broken etc. Can these be done prior to even placing a offer?

also, is $100 or more net cash per door still the goal of rentals?