There are many specific dimensional requirements for accessible toilet rooms. One is a minimum 60-inch wheelchair turning space. If the building or space lacks accessible toilet rooms, reconfiguration or construction of a new one may be required, adding cost and possibly taking up floor space.
The best way to find out whether an existing building ticks all the boxes for accessibility is to visit the site with an architect.
Accessibility requirements take many business owners moving into existing buildings by surprise. Our recommendation is that you consult with an architect early in your planning process. We encourage you and your architect to come in for an early consult meeting, to make sure we are all on the same page about what is required and how you plan to meet the requirements.
Also note that for existing buildings, Minnesota State Building Code accessibility requirements may be less restrictive than federal ADA requirements. You should be aware of ADA requirements and factor those requirements in to your decision-making when planning your project. Your architect can assist with understanding ADA requirements.