The house is in Chester, PA, but borders with Brookhaven, PA and Parkside, PA, in Delaware County, PA.

First off, you should consult with a cross border legal and tax specialist to determine the most appropriate entity structure to use to hold the property.  

Plus prices go up the farther you get from downtown so Webster is closer to that sweet spot on the city/county border.

To find out, speak to the owner, neighbors or any local realtor.To the latter, I'd say this is the same gamble any local builder would take. 

relationship with gold:Having spent quite a bit of time working on private yachts which is largely a cash business I also know some people who use gold as a way of transporting money across borders, since it is a lot easier and less suspicious to carry around a few pieces of jewelry or an expensive watch than large bundles of cash. 

With median sales prices of homes below the citywide average, the fact that renters are housing burdened is a function of the higher demand for moderately-priced rental units in Baltimore." linkcrime map for your area bordered in green:

The neighbors in the house that borders the side lot are complaining that their dog "barks all night and causes our dogs to bark as well."  

Appreciation gamble?

Speculation is Gambling.

It becomes a crap shoot for the company, but they are gambling with the investors money.2.