The posted coordinates take you to the window of a restaurant that was one of my Dad's favorite places. Almost every day, he would be there first thing in the morning, often before the cooks, and get coffee going, and fill up the ice in the drink dispenser (he had his own key). You would never have to worry about sitting in a wiggly chair. He would go around and tighten all the screws. On holiday mornings, when the restaurant was closed, he would pace around the house, not knowing what to do with himself.
You do not have to go inside to solve the puzzle, but if you're hungry, the food is good, and the staff is friendly.
To solve the puzzle, go to the posted coordinates and use the phone number on the window on the right of the door (XXX-XXXX) to solve:
N 42° 57.ABC W 083° 49.XYZ.
A= 2nd digit
B= 1st + 2nd digit
C= 6th + 7th digits
X= 2nd + 3rd digits
Y= 4th digit
Z= 4th + 6th digits
The final is in an almost hidden city park. Despite growing up here, I never this park existed until I found the cache that was previously here. Stealth may be required.