There is a Kingdom Hall at 2401 Raven St. in the Carrick neighborhood of Pittsburgh, Pa that is owned by a deceased "brother (died 2006) and two trustees. This is on the Allegheny County property website. The image shows the picture of the building with a Kingdom Hall and www.org sign on it. I remember the story that the said "brother" donated the land and the money to build the Kingdom Hall many years ago. I guess that since everything is in this "brother's" and the trustees names, the WT Society cannot confiscate it. The county description shows it as being a place of worship.
Google Earth shows it as being the Pittsburgh Mandarin Congregation of Jehovah's Witnesses.
Very interesting!