CONGRATULATIONS ON NEW PREMISES/OFFICE

Dear Felix

It was a pleasure to see your new [office / manufacturing plant / etc.] the other day and to take a tour around the premises. I am certain that it will be a source of prosperity and enjoyment for you.

Allow me, then, the opportunity to compliment and congratulate you on your new [office / manufacturing plant / etc.] and to wish you the best in the future.

Regards
Lydia