Guide to the ADA Standards

Controls [§404.3.5]

Door and gate controls must be compliant as operable parts (operable with one hand and without tight grasping, pinching, twisting of the wrist, or more than 5 lbf). Clear floor space at controls must be located outside the door swing to prevent users from getting hit by the door.

Clear floor space at door control must be located outside door swing. 

Recommendation:  Placing controls in locations that preclude backing-up will facilitate usability. The clear floor space is not required to be centered at controls, but should be located to facilitate reach and operation.