北京市住建委5月份就与从事房屋租赁代理的中介机构共26家签订了承诺书，而在这26家机构中，
B-government I-government I-government I-government I-government I-government O O O O O O O O O O O O O O B-organization I-organization I-organization I-organization O O O O O O O O O O O O O O O O O O O O O