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Keith House - National Register of Historic Places Inventory—Nomination Form
says,
This is where Washington made his plans for his Christmas eve attack
When American troops were stationed along the banks of the Delaware River, the Keith family made its home available to General Washington. For ten days, from December 14 to 24, 1776 Washington made his headquarters in the Keith home. It was in this home that Washington met with aids staying in near-by homes to plan his Christmas eve attack on the Hessians in Trenton.
https://gis.penndot.gov/CRGISAttachments/SiteResource/H001684_01H.pdf