I agree that it does not reflect schooling that emphasized conventional and proper grammar.
At the same time, I'm not sure how "professional" the home-loan mortgage business really is. There are tens of thousands of them, and that's just in the greater Los Angeles area. Okay, just kidding, but the point is that there are tons of these offices. I don't know that I'd be very concerned about it unless I was going into business with them or something.
Were it my office I would have a cleaned-up form letter and close it with "I sincerely look forward to working together to satisfy your needs." That fits whether it's one or 1,000.
Happy refinancing.