The Philadelphia Housing Authority also released a plan recently to acquire a large portion of the Sharswood neighborhood (right next to Brewerytown)  for relocation of their headquarters from Center City and to develop the rest of the space for residential and commerical use. 

Developers of Land And Buildings24.

What future development is coming that way?

No matter how good your coach is, you need to develop yourself too by asking good questions on RE.Joining one or two good RE Investors Association in the city you live in will also improve, and speed up your learning rate.

If there isn't a lot of inventory than Why don't investors, especially in the Los Angeles area run towards developments?

If you can develop a site that has that demand, it will do well. 

Between them, you should be able to develop a clear understanding of how to buy income properties.

I have to screen for my first tenants and I need to develop a process,

Obviously they aren't in the lap of luxury but they are not in areas Id be afraid of after dark. 85710 and 85730 are pretty solid areas with older homes and no HOAs to deal with, unless you look in a development.  

So while rentals produce returns every month, the developer/owner is still accruing interest every month.