If I recall correctly from Focus40, isn't Orient Heights considered a pretty vulnerable facility to sea level rise and storm surge?The 411-space parking lots at Orient Heights are excessive-capacity for such an urban station, but the T has held onto them instead of turning them over for redevelopment strictly because that's where the storage expansion would go if needed. You'll see additional yard tracks get plunked down there, and probably a generous halving (or more) of the parking capacity.
Frankly, I'd love to see a Lynn or beyond extension relocate it's functions further inland somewhere, both for redundancy and so that you can then restore the Orient Heights yard to Belle Isle Marsh lands. (or substantial portions of it). Either the vacant lot across from Riverworks, or even more ideally the old ERR yard up in Salem.