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The U.S. Navy has awarded a $22.2 billion contract for the construction of nine additional Virginia class submarines.

The office of U.S. Sen. Jack Reed of Rhode Island on Monday announced the contract for General Dynamics’ Electric Boat in Connecticut and Huntington Ingalls Industries Inc. in Virginia, the two companies that have been building the attack submarines in partnership.

The submarines included in the latest contract are to be delivered to the Navy between 2025 and 2029.

They also will be slightly larger and have additional capabilities compared with earlier Virginia class submarines. The newer subs will weigh about 10,200 tons and have a length of 460 feet.

Reed’s office says the contract includes an option for a tenth submarine that could raise the contract value above $24 billion.

Employment at Electric Boat is expected to peak in 2028 and grow 7.3 percent over current levels by 2040, but already multifamily developers are responding to the increased demand with new projects in New London, East Lyme and Norwich, among other communities. Around 5,000 total units are in the development pipeline in the region, the report found, in complexes of apartments, condominiums and townhomes. Surveys of current Electric Boat company employees found that demand will be highest for homes and apartments that cost around $1,000 per month in rent or mortgage costs – within reach of those making the company’s $40,000 starting salary – and $1,500 per month – within reach of those making the company’s average salary of $60,000.