Demising Wall
The shared wall that separates one tenant's unit from another in a multi-tenant building, defining each suite's demised premises.
Definition
A demising wall is the partition between adjoining tenant spaces. In small bay and flex buildings it usually runs from slab to roof deck (or to a fire-rated ceiling assembly) so each unit is a discrete demised premises with its own entrance, utilities, and often its own roll-up door. Demising walls are where unit mix flexibility lives: developers and landlords can add or remove demising walls along structural bay lines to combine or split suites as demand shifts. Construction quality matters. Fire rating, acoustic separation, and utility routing through or around the wall affect code compliance, insurance, and tenant complaints about noise or odor from neighbors. When a tenant expands into an adjacent suite, removing or opening a demising wall is a capital decision that changes rentable SF, CAM allocations, and future reletting options.
Example
A 50,000 SF flex building on 25-foot bay spacing has demising walls at every other bay, creating ten 2,500 SF units. A growing HVAC tenant takes the adjacent suite. The landlord removes a section of demising wall to create a 5,000 SF combined unit, then rebuilds the wall later if the space is relet as two suites.
See Also
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