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Article 1: In accordance with **relevant technical standards, the ‘Rules for Calculating the Sales Area of Commercial Housing and the Allocation of Common Area Areas’ (Trial) are formulated. Article 2 These rules apply to the sale of commercial housing and property rights registration. Article 3: The sales of commercial housing are calculated based on the building area. The building area shall be calculated in accordance with the **current ‘Rules for Calculating Building Area’**. Article 4: When a whole building of commercial housing is sold, the sales area of such housing is equal to the total construction area of the entire building (basements used as civil air defense facilities should be deducted from the total construction area of the building). Article 5: Commercial residential properties are sold on a “unit” or “apartment” basis. The sales area of such properties is equal to the indoor area of the unit or apartment purchased by the buyer (hereinafter referred to as the indoor area) plus the shared common area. Sales area of commercial housing = Built-up area within the unit + Shared common area. Article 6: The built-up area within the unit consists of the following three parts: 1. The usable area within the unit (apartment) ； 2. Area of interior wall surfaces ； 3. Balcony floor area. Article 7 The calculation principles for various components of the indoor floor area are as follows: 1. The usable area within a unit (apartment): For residential buildings, it is calculated in accordance with the methods specified in the \"Code for Design of Residential Buildings\". Other buildings. Calculate using the methods specified in the codes for the design of special-purpose buildings, or refer to the Code for the Design of Residential Buildings. 2. Area of interior walls: The retaining or load-bearing walls surrounding the usable space within each unit of a commercial property can be either shared walls or non-shared walls. The partition walls between various apartments (units) in a commercial housing complex, the partition walls between the apartments (units) and the common building areas, as well as the exterior walls (including gables) are all shared walls. Half of the horizontal projection area of such shared wall surfaces is counted as part of the wall area within the apartment. The horizontal projection area of non-shared wall surfaces is fully included in the area of the interior walls. 3. Balcony floor area: Calculated in accordance with the **current ‘Rules for Calculating Floor Area’**. 4. The formula for calculating the indoor usable area is as follows: Indoor usable area = Indoor usable space + Area of interior walls + Area of balconies. Article 8 The common area consists of the following two parts: 1. Elevator shafts, stairwells, garbage chutes, transformer rooms, equipment rooms, public lobbies and corridors, basements, security rooms, as well as other public and administrative spaces that serve the entire building in terms of functionality ； 2. Half of the horizontal projected area of the partition walls between the units and the common building spaces, as well as the exterior wall walls (including gables). Article 9 Principles for Calculating Common Area Area Basements, garages, etc. that have been sold or rented as separate usable spaces shall not be included in the common area area. Basements used as civil air defense facilities are also not included in the common area floor area. The common area of a building is calculated as follows: The total floor area of the entire building, minus the sum of the interior floor areas of all the units within it, and minus the floor areas of basements, garages, and other structures that are sold or rented as separate spaces, constitutes the common area of that building. Article 10 Calculation of the Coefficient for Allocating Common Area Area The coefficient for allocating the common area area of a building is obtained by dividing the total area of the common areas in that building by the sum of the individual interior areas of all units within the building. Common area area ＿＿＿＿＿＿＿＿＿＿＿＿＿ Coefficient for allocating common area area Sum of the interior areas of each unit Article 11 Calculation of allocation of common area area The interior area of each unit is multiplied by the coefficient for allocating common area area, to determine the amount of common area area that should be allocated to each buyer. Allocated common area area = Common area allocation coefficient * Private building area. Article 12: The sale of other types of housing and the registration of real estate ownership may be carried out in accordance with these rules. Article 13 These rules shall be interpreted by the Ministry of Construction. Article 14 These rules shall come into force as of December 1, 1995.