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City of San Mateo Municipal Code.

27.04.350 OPEN SPACE.

"Open space" means that portion of a site that has not been covered by buildings, structures, or parking areas or driveways. Open space areas include, but are not limited to, parks, playgrounds, beaches and waterways.

"Usable open space" means outdoor area on the ground, balcony, deck, porch, or roof which is designed, improved, developed and maintained to be used for outdoor living, recreation, or garden purposes. However, for purposes of receiving a bonus to increase the floor area ratio (FAR), not more than 10% of improved roof decks, roof gardens or roof recreation facilities will be granted. The minimum standards for a roof used for gardens, decks or recreational purposes shall be established by resolution of the City Council. Further, off-street parking and loading areas, driveways, and required sidewalks are not counted in calculating usable open space.

(a) Private Usable Open Space.

(1) "Residential private usable open space" means open space adjacent to a dwelling unit or units designed and reserved for the use of the occupants.

(2) "Commercial/executive private usable open space" means open space which is improved for the use of employees and guests of the development, such as an inner courtyard.

(b) Common Usable Open Space.

(1) "Residential common usable open space" means open space accessible to all occupants of a residential complex. Pedestrian and bicycle paths, swimming pools, and tennis courts are typical forms of residential common usable open space.

(2) "Commercial/executive common usable open space" means open space in the form of a plaza, square, court, or other urban space which is at least 75% open to the sky, free from automotive traffic, and accessible to the public at large.