There are consequences. The management know this.
The management have said they are going to have to spend money changing the women’s facilities (only 10 years old and a big operation to install) to increase individual privacy. This has economic, space, environmental, health and safety implications.
Making sure a cubicle is well aired to prevent damp, the floor is easily mopped, the cubicle isn’t misused and the occupant(s) are able to seen/heard in an emergency will be things a risk assessment picks up, if they do one, now they want an official change of use.
The toilets, for instance, will have to be enclosed, in separate rooms, with the sink and dryer in with the toilet. In unisex toilets the turnover will be slower so the excepted calculations are you need 25% extra units for a comparable turnover to single sex cubicles within a washroom. Or you have less toilets and bigger queues.
These are the realities of the decision to change the space to mixed sex.
Any deviations in design are against building regulations.