Dear
As you may already know, __(Name of Organization)__ is currently undergoing renovations at its __(retail/warehouse/showroom/etc.)__ location. Completion of the newly designed area will serve to enhance __(briefly describe type of function(s) that will be better for customers)__ and we are looking forward to being able to offer you better service in __(that/those)__ area(s) soon.
It has been estimated that completion of these renovations will be around __(when)__. Though we realize that our customers will be inconvenienced to some degree while we are in the midst of all the construction, we want to thank you your patience and understanding as we all try hard to work around it. Rest assured, it will have been all worth our while.
Thank you again, for your patience and understanding. It is greatly appreciated.
Yours truly,