Dallas-based investment group Ashford Hospitality Trust Inc. agreed to acquire the Fremont Marriott Silicon Valley hotel for $50 million. The acquisition deal for the 357-room hotel is expected to close within the next 30 days. Upon closing, the property will be managed by Remington Lodging. Originally developed in 1999, the Fremont Marriott Silicon Valley has about 15,000 square feet of meeting space across 19 meeting areas, including its 7,590 square-foot Grand Ballroom. The hotel at 46100 Landing…