Mercy Hospital CEO Charlie Therrien said Tuesday that the hospital would like to keep a presence at its State Street location in Portland, “but we’re not locked in.” Administrators expect the hospital to move to a new campus on the Fore River Parkway in 2021. Staff photo by Shawn Patrick Ouellette Before Mercy Hospital leaves the downtown Portland site it has occupied for 75 years, it wants a say in what replaces it. The hospital, which intends to move in 2021 to a new campus on the Fore River Parkway, has issued a “request for information” to potential developers of its 144 State St.