So what happens to the property? Can the city declare it abandoned? Can they take ownership and sell it? Clearly it shouldn't just sit there.

The actual address is 520 Black Horse Hill. The owner and executor are both deceased. No further contact available. Property will most likely go to Tax sale in the future and then there may be a new owner. In the interim, DPW has been notified to cut the grass and lien the property.

Oh wow. Thanks for the information. I am sorry to hear about the owners.
The only reason I wrote 539 is because that is what the mailbox says in front of it.