Head of the Department of Magical Law Enforcement's office

Yaxley's office is mentioned in the 7th book(Harry Potter and the Deathly Hallows). Ron who is impersonating a member of the ministry has to go to Yaxley's office to fix the raining problem. Hermione suggests to Ron to attempt to use Finite Incantatem spell to stop it raining in Yaxley's office.