Mastro’s Steakhouse will join the businesses coming soon to Fields West. Mastro's is the latest in more than two dozen businesses leasing in the future Fields West development. Fields West is a 55-acre urban village within the Fields development, which is a 2,500-acre master-planned community. Fields West will offer 360,000 square feet of shopping, dining, and entertainment, as well as 350,000 square feet of Class A office space.