Tier 1 covered building means a building where the sum of
nonresidential, hotel, motel, and dormitory floor areas exceed 50,000
gross square feet, excluding the parking garage area.
Tier 2 covered building means a building where the sum of
multifamily residential, nonresidential, hotel, motel, and dormitory
floor areas exceeds 20,000 gross square feet, but does not exceed
50,000 gross square feet, excluding the parking garage area. Tier 2 covered buildings also include multifamily residential buildings where floor areas are equal to or exceed 50,000 gross square feet, excluding the parking garage area.