Are you sure about this? I though it was permissible under fire regulations to have mag lock doors where the mag lock automatically fails when the fire alarm goes off and where a press to exit in case of fire button is provided adjacent to the door.
Coincidently, the office block I work in, which is only 5-6 years old has this type of mag lock with release button on a lot of the emergency exit routes - not on the fire doors in corridors, but on the actual doors from particular areas of the building. I'm not a fire expert, but I have been involved in some major building projects in recent years - my employer has been expanding - and the mag lock with automatic fail/push button seems to be the standard in a lot of recently constructed buildings and these buildings have been inspected by the fire brigade.