Morrisville Unified Development Ordinance – September 2018

Article 3: Zoning Districts Section 3.8. Overlay Districts 3.8.4. Town Center Conservation Overlay (TCCO) District

(6) Developable Area (A) The minimum lot size may be reduced to 4,500 square feet. (B) Development shall be sited amongst established trees to maintain the open character of the remainder of the site to the maximum extent practicable. (C) The maximum number of dwelling units in the Town Center Conservation Overlay District shall match the maximum number allowable under the base zoning for the district. First the “buildable area” shall be calculated by taking the total site area and subtracting the area for all required riparian buffers and perimeter buffers, as well as floodways and street rights-of-way. A factor consisting of ten percent of the total site area shall be used for the street right-of-way. The “buildable area” shall then be divided by the minimum lot size for the base zoning district to establish the “lot yield”. The lot yield shall be rounded down to the nearest whole number to determine the maximum allowable number of dwelling units that can be built on the site. (7) Density Bonus (A) An applicant may petition the Town for a density bonus of up to an additional 20 percent of the maximum allowable number of dwelling units allowed under the base zoning if the applicant permanently dedicates open space to the Town for public use in a manner consistent with the current Town Center Plan (as determined by the Planning Director) and the current Parks, Recreation, Greenways, and Open Space Master Plan (as determined by the Parks & Recreation Director). The number of additional dwelling units granted shall be commensurate with the amount of open space dedicated. The Town Council shall decide whether or not to grant the density bonus requested by the applicant. (B) If the maximum lot yield allowed through the density bonus cannot be accommodated on a given site, as determined by the Planning Director, then the applicant may reduce the required open space. However, in no case shall the amount of protected open space be less than 70 percent of the total site area. b. Development in Town Center Commercial (TCC) and Floodplain Overlay (FO) Districts The following standards apply to new development within the Town Center Commercial (TCC) District, where part of the development site is located within the Floodplain Overlay (FO) District. (1) Buildings shall be clustered out of the Floodplain Overlay (FO) District to the maximum extent practicable. (2) The maximum structure height may be increased to three stories for developments that cluster buildings out of the Floodplain Overlay (FO) District. However, the maximum floor area ratio (FAR) shall not exceed the maximum allowed in the underlying base district. (3) Impervious areas, such as parking lots, that are located within the Floodplain Overlay (FO) District shall incorporate Low Impact Development (LID) techniques to protect water quality and reduce run-off. Low impact development techniques may include infiltration rain gardens, grass swales, or other porous landscape stormwater detention areas as approved by the Town Engineer. These shall be provided in addition to the Town ’ s standard stormwater requirements.

(Ord. No. 2015-002, 04/29/2015)

September 25, 2018 Morrisville, NC Page 3-68 Unified Development Ordinance