Let's say for some reason a business owner decided to make all their restrooms unisex. These are not single-person rooms, but larger restrooms with numerous toilets (and possible urinals).

Is there any reason this would not be allowed legally? I know there are requirements for restrooms, but I'm not aware of any requirement that explicitly states there must be separate accommodations for separate sexes. Can an owner provide only unisex multi-person restroom if they so chose?

Let's use my home state of Maryland where state law is relevant.