Going even further the competitiveness of any area is going to change in each subdivision or neighborhood.  20851 is a pretty competitive market, but the neighboring zip code of 20906 is much less competitive.

I prefer certain zip codes, primarily single family homes 2-3 bedrooms. 

You need to send to old deed dates and preferrable properties that you know need work... like code violations.but before you do any of that, you really need to build your buyers list first. 

Within each post code, there are usually A, B, C, D and F neighborhoods which can be quite close to each other - which require LOCAL KNOWLEDGE to determine.Your Real Estate Agent believes (by definition) that $52,000 is the highest price available from the market at this time, which therefore means that $52,000 IS its market value.

You weren't screwed over, but you did just get a very good lesson in negotiations.There's nothing here that's illegal or against the Code of Ethics, as you presented them.

What are the zip codes and neighborhoods in PG County that investors are actively investing? 

Zoning, health dept. permits, land restrictions, building permits to meet code (garages aren't the same as dwellings), etc.

If it not, the mortgage company will confiscate the insurance check and dole it out piecemeal and subject you to inspections before they dole out each breadcrumb.Also, if it is an older house, it will have to brought up to code, which will cost more money. 

The rebates/discounts are pretty great for owners on the smaller scale of commercial properties.I was wondering...is this something that commercial property owners are even interested in?

Zip codes to look in [and stay away from], comments, thoughts - any and all advice would be much appreciated!!