Change owner of a Project

Hi--my organization hired an external contractor to set up a Project for us that includes a series of Templates, files, templates, etc. There are dozens upon dozens of files in this Project.

Long term, I would like to own the Project, or have it be owned by the Company's "brand" account. I can't find any way to do this. I found some workaround online, but they involve sharing a project newly with a user and the instructions don't work for me (I already have access to the Project, I just don't own it).

Any help? What do I do? Any time I duplicate a file, folder, anything in the Project it still isn't owned by me. I can't get it out of the Project or move it anywhere. Help?!