随着外资企业的不断涌入中国 ,市场对写字楼的要求也越来越高。那些经旧楼改造而成的写字楼已经远远不能满足这些公司的需求 ,一些高档写字楼也就应运而生。北京写字楼市场主要分Ａ级写字楼和Ｂ级写字楼。Ａ级写字楼一般都有外销许可证 ,发展商主要为香港或国外的知名房地产商 With the continuous influx of foreign-funded enterprises in China, the market demand for office buildings is also getting higher and higher. Those transformed from old buildings are far from meeting the needs of these companies. Some high-end office buildings have also emerged. Beijing office market is divided into A-class office buildings and B-class office buildings. Grade A office buildings generally have export licenses, developers are mainly well-known real estate developers in Hong Kong or abroad