How to have straight lines in 3D model

In a recent project I did a 3D map of a building. There is another building close to it and got in the 3D map. They don’t want their building in the same shot and would like it removed. In a normal photo this would be straight forward. But wondering if there is a way for me to basically draw boundaries for the 3D model so it just shows the intended building and it’s property line.

Greyson, have you tried the point cloud densification area? Or you can use the point cloud editing tool to classify points of the neighboring building in the Deleted class.