Mary, Building Tenant
I would like to take this opportunity to let you know how much we at the [office at a building serviced by TUBS] appreciate the extra effort your employees gave to us to assist us in preparing for the visit from the [prominent person].
The employees from Tasks Unlimited responded quickly to each request me made during the two weeks before the visit. They gave their full attention to details and performed those tasks in a friendly and professional manner.
Their assistance was, and continues to be, much appreciated.