a. For towers outside of public rights-of-way, if the modification increases the height of the tower by the greater of: (a) more than 10 percent, or (b) by the height of one additional antenna array, with separation from the nearest existing antenna not to exceed 20 feet; or

b. For those towers in the rights-of-way and for all base stations, if the modification increases the height of the tower or base station by the greater of: (a) 10 percent, or (b) 10 feet.

a. For towers outside of public rights-of-way, if the modification involves adding an appurtenance to the body of the tower that protrudes from the edge of the tower the greater of: (a) 20 feet, or (b) the width of the tower structure at the level of the appurtenance; or

b. For other eligible support structures, if the modification protrudes from the edge of the structure more than six feet.

a. For any eligible wireless support structure, if the installation includes more than the standard number of new equipment cabinets, not to exceed four; or

b. For towers in the public rights-of-way and base stations, if the modification involves installation of any new equipment cabinets on the ground if there are no preexisting ground cabinets associated with the structure, or else involves installation of ground cabinets that are more than 10 percent larger in height or overall volume than any other ground cabinets associated with the structure.