HONG KONG — Chi Kee Sawmill & Timber, Hong Kong’s last operating sawmill, has been processing timber in the city for 75 years. Soon the family-run factory near the territory’s border with mainland China might be forced to shut down as part of a development project: it received notice earlier this year that it had to vacate its current premises, which it has occupied for nearly four decades, to make way for a development project. Hong Kong residents have been visiting Chi Kee to buy bits of the wood piled high up around the sawmill and collect a small piece of Hong Kong’s heritage. …Today, woodworking factories like Chi Kee have become a sunset industry in Hong Kong, now that mass-produced, imported furniture has become readily available. Most sawmills either have closed down or moved across the border into China, where manufacturing costs are cheaper.