PARKING BUILDING is a building designed for car parking and where there are a number of floors or levels on which parking takes place. It is essentially a stacked car park. Functional Requirements The parking geometries like the size, height, and turning radius of automobiles, trends of automobile size and statistical quantity must be taken into account. The streets surrounding the facility and their traffic flow must be taken into consideration when planning entrances and exits and deciding on ramp designs. The entrances and exits are very important to the smooth functioning of the facility, with the type of use again determining the length from the opening and placement of the entry booths, as well as the quantity of entrances and exits. Natural or mechanical ventilation provides fresh air flow to disperse car exhaust in normal conditions, or hot gas and smoke in case of fire. The operation and maintenance of a facility is very critical. Revenue control equipment and other issues related to the smooth functioning of the garage must be taken into account during the design process. Provide an area or room for the storage and maintenance issues. This area should be heated/air- conditioned and contain a mop sink. Accommodate technological tools for future upgrades of operational systems and facility expansion. Plan for a back up power system. Natural ventilation is always a good method however detailed study is required in some areas and types of parking facility design to determine its effectiveness. Lighting is a crucial aspect of parking and type, placement, and quantity needs to be carefully studied to provide enough light for the users of the parking garage and not to spill out of the parking facility affecting surroundings. The design loads for car parks are often less than the office building they serve (50 psf versus 80 psf), leading to long floor spans of 55–60 feet that permit cars to park in rows without supporting columns in between.