(a) New Construction. For any new construction of a principal structure which requires a building permit in any zoning district except single-family, two-family, and triplex units which are expressly exempted or for any new construction of a principal structure for institutional use in any district.

(b) Building Alteration. For any building alteration over 15,000 square feet, any alteration increasing the gross floor area of a building or buildings by 50 percent or more, any alteration increasing the height of a building by one story or more, or any alteration that results in a significant change to vehicular circulation or in the net reduction of off-street parking by 20 percent or more.

(c) Site Alteration. For any new parking or outdoor storage area, or any alteration increasing the area of a parking or outdoor storage area by 50 percent or more.

(d) Accessory Uses and Structures. Site plan review shall be required for accessory uses and accessory structures greater than 400 square feet, or when one or more structures result in the net reduction of off-street parking or a significant change to vehicular circulation. Accessory uses and/or structures may be reviewed in conjunction with the review of principal structures when such accessory structures are shown on the site plan.

(e) General Provisions. A site plan is required whenever a specific reference is made to these regulations in any other part of the code of the City of Topeka. (Ord. 20062 § 40, 4-18-17.)