(1) parking areas with ten or fewer spaces shall have at least one ten-point tree for every five spaces or fraction thereof planted within the interior of the parking lot.

(2) parking areas with 11 or more spaces shall have at least one five-point tree for every five spaces or fraction thereof interspersed throughout the parking area. In addition, one ten-point tree shall be placed at the end of each row where internal curbing would be placed, even though internal curbing may not be required. However, trees must be protected from vehicular encroachment.

(3) Subsections (a)(1) and (2) of this section may be satisfied by cluster plantings, at the discretion of the building official.

(4) parking areas in the C-1 and M-1 districts and parking areas in the R-3 districts that contain 16 or more parking spaces shall be planted to a width of at least two feet of the entire perimeter facing the public right-of-way, except for ingress and egress and sidewalks. The perimeter shall be planted with decorative shrubs and bushes three feet in height to form a visual screen with a density of 80 percent within two years of planting. Perimeters facing such public right-of-way shall, in addition, have five tree value points planted every 35 feet with at least ten tree values on a minimum 50-foot C-1 lot and 15 tree values on the minimum 75-foot R-3 lot.

(5) No trees shall be planted that will obstruct visibility at intersections or points of ingress and egress to streets. See section 110-469. The perimeter footage defined in section 110-469 and ingress and egress shall not be used to calculate landscaping of perimeters.

(6) Existing trees in proposed internal parking areas as listed under subsection (b) of this section shall not be removed if over three inches diameter at breast height (dbh) without a permit from the building official. Every effort shall be made to build, pave or otherwise construct around existing trees of value.

(7) Each landscaped area, both within the interior parking area and around the perimeter, shall be served by a functioning underground sprinkler system adequate to maintain all landscaping.

(8) All landscaping specified in this subsection shall be properly maintained and replaced if for any reason it does not survive.

(9) The value of the landscaping for the internal parking areas and their perimeter, as well as all additional external landscaping for other areas on the site, will not be less than one percent of the total cost of the project, including land acquisition, or three percent of the project, excluding land acquisition, whichever is greater.