To carry on the business as builders, property developers, civil, mechanical and labour contractors, building and erection engineers, dealers in, importers, exporters and manufactures of prefabricated and recast houses, materials, tools, implements, machinery and metal were in connection therewith or incidental thereto and to carry on any other business that is customarily, usually and conveniently carried on therewith in or outside india and to purchase, structures and to turn the same into account, develop the same dispose-off or maintain the same.