编辑同志:我们90户住户于2009年3月与一家房地产开发公司签订了《商品房买卖合同》。合同约定:由我们购买其待建的90套商品房住宅,分三个单元,每单元30套,楼盘总层数为15层。近日交房后,我们发现公司已擅自超建5层,增加的30套住宅另卖他人,造成小区容积率大幅提高,人均实际占有 Editorial comrades: We 90 households in March 2009 with a real estate development company signed a “real estate sales contract.” The contract stipulates that we buy 90 units of commercial housing to be built in three units with 30 units per unit and the total number of properties for sale is 15. Recently submitted to the house, we found that the company has super-built 5 layers without permission, an increase of 30 sets of homes to sell others, resulting in a substantial increase in residential plot ratio, the actual per capita possession