City Owned Properites

[Valeria Valdes]

While working on an Absentee yellow letter campaign, I came across a property on my list who's owner was the city where I live in. The mailing address led to the City's Financial Department in downtown.

What exactly does it mean when a city owns a property? What are ways they could have acquired it? 

Also, should I remove this property from my list of mailers since it will be sent directly to the City?

Thanks in advance for any help/information.

-Val