Working in China for more than 5 years

I have lived and worked in China since June, 2008. I have always had the proper visa, paid taxes, and no criminal record. I would like to apply for a permanent resident one because at this time I am having to renew it every six months, for corporate reasons unrelated to my personal situation. I am wondering if there are agencies or attorneys that specialize in this type of work, as I am under the impression that the laws about this subject have changed a lot in the last year or so. Any suggestions would be appreciated.