A. 
Purpose. Special purpose zoning districts are tools for addressing unique areas or accomplishing special planning and zoning goals. Special purpose districts are base zoning classifications; they do not over-lay other base zoning districts.
B. 
Establishment. Special purpose districts may be established, amended or removed only in accordance with the Zoning Map amendment procedures of § 475-1103.
A. 
Purpose. The PI-1, Neighborhood-Scale Institutional and Public District is intended to accommodate small-scale, low-intensity public, civic, and institutional uses that are commonly found in or near residential neighborhoods.
B. 
Mapping. The PI-1 District designation may be applied regardless of ownership of the land on which the use is located. PI-1 zoning is intended to identify the public or institutional use of the subject property, not necessarily the ownership or control of the property.
C. 
Permitted uses. Uses are allowed in the PI-1 District in accordance with the use regulations of Article VII.
D. 
Lot and building regulations.
(1) 
Maximum district area. In order to maintain the intended low-intensity, neighborhood-scale character of the PI-1 District, the maximum contiguous PI-1 zoned area may not exceed three acres.
(2) 
Lot and building regulations. The size, location, and design of all buildings, structures, activity areas and other site improvements must comply with the lot and building regulations of the most restrictive abutting zoning district, except that no minimum lot area or lot width requirements apply in an PI-1 District.
(3) 
Other regulations. Development in an PI-1 District is subject to all other applicable regulations of this chapter, including parking, landscaping and other regulations of general applicability.
A. 
Purpose. The PI-2 Campus-Scale Institutional and Public District is intended to accommodate development and expansion of large public, civic and institutional uses, while minimizing the potential for adverse impacts on surrounding areas.
B. 
Mapping. The PI-2 District designation may be applied regardless of ownership of the land on which the use is located. PI-2 zoning is intended to identify the public or institutional use of the subject property, not necessarily the ownership or control of the property.
C. 
Allowed uses. Uses are allowed in the PI-2 District in accordance with the use regulations of Article VII. Other uses may if expressly approved as part of an institutional master plan.
D. 
Development review.
(1) 
Applicability. Unless otherwise expressly exempted, development review and approval is required before the issuance of any building or development permit in the PI-2 District. To comply with the development review requirements of this section, applicants must submit and secure approval of an overall institutional master plan in accordance with the requirements of this section.
(2) 
Exemptions. The following are exempt from the development review requirements of this section:
(a) 
Development that complies with a valid, approved institutional master plan;
(b) 
Interior building alterations if the alteration will not result in an increase in the number of employees or the creation of or need for additional parking spaces; and
(c) 
Exterior building modifications that will not result in an increase in the number of employees or the creation of or need for additional parking spaces.
E. 
Lot and building regulations.
(1) 
Transitional areas. The size, location, and design of all buildings, structures, activity areas and other site improvements located within 150 feet of the boundary of any abutting R Zoning District, are subject to the abutting R District's lot and building regulations, except that no minimum lot area or lot width requirements apply in the PI-2 District.
(2) 
Interior site areas. Areas of a PI-2-zoned site located more than 150 feet from the boundary of an abutting R Zoning District are governed by the regulations approved at the time of institutional master plan approval. Institutional master plans must include the applicant's detailed description of the regulations proposed to be used.
(3) 
Multiple principal building and uses. Multiple principal uses and buildings are allowed on a single lot in the PI-2 District.
F. 
Institutional master plans.
(1) 
Purpose. Institutional master plan requirements provide a framework for development of public, civic and institutional uses in campus-like settings. Approval of an institutional master plan is intended to protect the character and integrity of adjacent areas while allowing flexibility in site development and design that is not possible when development occurs on a lot-by-lot or building-by-building basis.
(2) 
Planning area. An institutional master plan must include all land located within the proposed PI-2 District and depict all land uses within the area extending out at least 300 feet from the PI-2 District boundary.
(3) 
Existing property and uses. The institutional master plan must include a description of land, buildings, and other structures occupied by the institution as of the date of submission of the institutional master plan. At a minimum, the following information shall be required:
(a) 
Illustrative site plans showing the footprints of each building and structure, together with roads, sidewalks, parking, landscape features and other significant site improvements;
(b) 
Land and building uses;
(c) 
Gross floor area;
(d) 
Building heights;
(e) 
Landscaping and lighting; and
(f) 
Off-street parking and loading facilities.
(4) 
Uses and development envelope. The institutional master plan must include a description of all proposed land uses to be allowed and the land area and development envelope within which future development will occur. The development envelope must be described in writing and through the use of drawings or models. The plan must include the following in describing the development envelope:
(a) 
Floor area;
(b) 
Height;
(c) 
Setbacks;
(d) 
Total open space; and
(e) 
Total number of motor vehicle and bicycle parking spaces to be provided.
(5) 
Transportation plan. The institutional master plan must include a study that identifies traffic and parking impacts associated with the proposed use and a plan for mitigation of transportation-related impacts, including consideration of motorized and nonmotorized travel.
(6) 
Approval procedures. Institutional master plans require review and approval in accordance with the development plan procedures of § 475-1104.