Keystone Hotel is a historic home located at Hummelstown

Hummelstown, Pennsylvania

Hummelstown is a borough in Dauphin County, Pennsylvania, United States. The population was 4,360 as of the 2000 census. It is part of the Harrisburg–Carlisle Metropolitan Statistical Area....

, Dauphin County, Pennsylvania

Dauphin County, Pennsylvania

Dauphin County is a county in the U.S. state of Pennsylvania and is one of the three counties comprising the Harrisburg–Carlisle Metropolitan Statistical Area. As of 2010 census, the population was 268,100. The county includes the city of Harrisburg, which has served as the state capital...

. The original building was built in 1839, and was more than doubled in 1850. It was originally a 2 1/2-story, rectangular brick building with gable roof in a vernacular Federal

Federal architecture

Federal-style architecture is the name for the classicizing architecture built in the United States between c. 1780 and 1830, and particularly from 1785 to 1815. This style shares its name with its era, the Federal Period. The name Federal style is also used in association with furniture design...

 style. The 1850 expansion raised and flattened the original roofline, and added a three-bay, three-story brick addition to the east side. An old brownstone

Brownstone

Brownstone is a brown Triassic or Jurassic sandstone which was once a popular building material. The term is also used in the United States to refer to a terraced house clad in this material.-Types:-Apostle Island brownstone:...

 addition pre-dates the 1839 building.

It was added to the National Register of Historic Places

National Register of Historic Places

The National Register of Historic Places is the United States government's official list of districts, sites, buildings, structures, and objects deemed worthy of preservation...

in 1985.