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(a) Usable area. The usable area upon which the density of development is calculated, as set forth in section 59-C-1.622, is determined by deducting from the gross area of the tract the following:
(1) All land indicated on the master plan of highways as a right-of-way with a width of 100 feet or more; and
(2) All ultimate 100-year floodplain areas which, in the opinion of the planning board, would constitute an excessively high percentage of the total area of the tract.
(b) Townhouse frontage. Each townhouse must front on a public street, a private street or a common open space.
(c) Common open space. The preliminary or site plan must include a description of the procedure and methods to be followed for assuring the common use and adequate maintenance of common open space included in the plan.
(d) Dedicated land. Land dedicated to public use for school and park sites may be included in the calculation of the density of development, provided that development of the remaining land can be accomplished in compliance with the purposes of this section.
(e) Development in different zones. The planning board may permit a combined MPDU development in 2 or more zones, each of which has provisions for MPDU development, provided that each of the following conditions is complied with:
(1) The tracts to be combined for development must share a common boundary with one another sufficient to provide a unified development which will achieve the purposes of MPDU development.
(2) No uses are permitted in any part of the combined tract except those that are permissible in the zone in which that part is classified.
(3) The total number of dwelling units in the combined development does not exceed the total number that would be permitted if the component areas of the combined tracts were developed separately.
(4) The amount of green area in the combined development is not less than the total amount that would be required if the component areas of the combined tracts were developed separately.
(f) Preservation of trees. The preliminary plan and site plan must show the location and extent of all trees as well as methods for preservation of those trees selected to remain.