Arbor Hill Historic District–Ten Broeck Triangle
Open space within the district include a few vacant lots and parking lots. Most are planned however, such as Van Rensselaer Park, the neighboring space around the church known as St. Joseph's park, and the large parcel at the district's northeast corner where the Ten Broeck Mansion and its gardens (and formerly carriage house) are located. Mature trees are abundant throughout. Topographically the district rises almost a hundred feet (30 m) from its eastern and southern edges to level terrain along North Swan between Second and Third. This reflects the ravines that existed there when Albany was first settled, later partially filled in to facilitate development, now the neighborhood of Sheridan Hollow, which separates Arbor Hill and the district from downtown Albany.
Arbor Hill Historic District–Ten Broeck Triangle
The irregular quadrilateral within this boundary includes six large blocks covering . In addition to the streets already named the entirety of St. Joseph's Terrace and Hall Place are within the district. It has 220 contributing resources, with only two non-contributing modern properties. One hundred of those properties are houses, primarily two- to three-story wood frame or brick structures built between the 1820s and the early 20th century. The remainder are either small commercial buildings, institutional structures such as the three churches in the district.