Dear _______________ (name of the firm)

When we received your notice of expansion, we at __________________ (name of firm) were elated.

There are few firms that can boast of the success you have achieved over such a relatively short period of time. A great deal of that success, in our opinion, must be directly attributed to your strong leadership and the sense of direction that you provide.

Please accept our heartiest congratulations and best wishes for your continued success.