Callender built a "stately white mansion ... on the banks of the Allegheny in 1822," overlooking Crull's Island.

Among his many enterprises were a lumbering business, the general store started by his father, a wool factory, an iron foundry, and further speculation ... his farm, internal improvements ... the blacksmith shop ... and the Irvine post office.

In the mid-1850s, Irvine was forced to give up most of his business, retaining the farm, the lumbering concern, and land on which he later developed oil.

Esther Newbold, great-granddaughter of Callender, was the last generation of the family to live in the mansion.

She "had studied law in Philadelphia and was known for keeping up on legislative matters in Harrisburg."

[4] A model of the house was made for the nearby Clinton E. Wilder Museum.

[4] Under Pennsylvania law, there are four types of incorporated municipalities: cities, boroughs, townships, and, in at most two cases, towns.