I don't have reliable information about a specific work titled "Floorplan (verso)" by Jasper F. Cropsey in my training data. Jasper Francis Cropsey (1823 1900) was a prominent American landscape painter associated with the Hudson River School, though graphite works on paper are less commonly documented in standard references. To provide accurate details about this particular drawing, I would need to verify its provenance and characteristics against authenticated museum or archival sources.