The pink wireframe is a parametric model, projected through the camera recovered from this same photo. Move a parameter on the right and the model leaves the photo while the error grows. Reset puts the solution back.

One photo. The solve fits this photo to 2.5 px, and hold-out and the camera sweep are quiet, yet the walls come out 11–18 % taller and longer than on the HABS measured drawings. The green dashed wireframe is the model from the drawings, seen through the same camera. No internal check sees this. A second photo does: solved together with this one, it brings the dimensions within 1 % of the drawings (next button).

Two photos together: this photo and a second one from the north-west, solved as one building with two cameras. Coping 2.559 m against 2.56 on the HABS drawings, its underside 2.353 against 2.35, south wall 4.05 against 4.01. The price of agreeing: each photo fits a little worse than alone (4.5 px here instead of 2.5), and the dimensions are right. The green and pink wireframes nearly coincide.