There are environmental issues in every state about the concentration of these systems.

If you concentrate on Income generation which would be one concern you might have then I would research what similar units in your area are renting for.

Just have to concentrate on buying value !

Since most of the job and population growth is outside my area ( NYC , Staten Island ) is it worth to start to invest local or should I concentrate on places where there is job growth and population growth increase ?

Jain,It will be hard to find cash flowing properties in the Bay Area.My rule of thumb to get a cash flow you rent need to be at least 1% of the purchase price.Meaning if you are buying $150000 property rent need to be $1500 monthly to be constantly cash flow positive.This rent to price ratio is unachievable in the bay area.If you are looking for the cash flow I would recommend to concentrate on out of state investments.If you want to learn more feel free to check this meetup: meetup.com/Los-Gatos-Real-Estate-Networking-Meetup/

Choose a location based on factors including:Rents increased faster than inflation.State and city populations increasing.Metro population > 1M.Low crime.Low operating costs.Tenant SegmentAfter selecting a location, choose a tenant segment with a high concentration of reliable tenants (by interviewing multiple local property managers).

I personally concentrate my investment efforts in the Columbus area and my team and I have a network of property managers, general contractors, and lenders etc. that I strongly recommend.

For MTR markets, it all depends on a highest concentration of hospitals.

You might also want to consider concentrating on ownership in just a few towns to cut down on all your management headaches, not just lawn care

My advice as a investor is for you to get out of debt first then concentrate on investing.