• Incidental uses are limited to 10% of the building area of the story where they are located. If a story is split up into two tenants, the 10 percent limitation is based on the floor area of each individual tenant space, rather than the whole story. If a B use of 2,500 SF is adjacent to a M use of 2,500 SF, the B use could have an incidental use of 250 SF. The limitation is found in IBC 509.3.

• This is super helpful, thanks so much!

Jin

• Just to make sure I got it all right. Consider a scenario that the entire 5th floor area is occupied by a single tenant which has a laundry room and a mechanical equipment space as incidental uses. If the entire floor area is 4000 SF, then 400 SF (4000x10%) would be the area limit for both the laundry and mechanical spaces. Correct?

• Yes, that is correct. If one tenant occupies the entire floor, the total aggregate SF of incidental spaces would be limited to 10% of the area.

• I think you guys are talking about accessory use instead of incidental use, right?