 Complete the following phrase:  Mason sought to expand his land and wealth. He greatly expanded the boundaries of Gunston Hall estate, so that it occupied all of Dogues Neck, which became known as Masons Neck. One project that Mason was involved in for most of his adult life was the Ohio Company, in which he invested in 1749 and became treasurer in 1752an office he held forty years until his death in 1792. The Ohio Company had secured a royal grant for to be surveyed near the forks of the Ohio River today the site of Pittsburgh, Pennsylvania. 