We're not certain that it guarantees, as another BUILD leader, Bishop Douglas Miles, put it, that Baltimore will never again see a deal in which "uptown is left out of the equation" of downtown development. Redeveloping Port Covington — an area that includes The Sun's printing plant, for which the paper has a long-term lease with Sagamore — is a personal mission of Under Armour founder Kevin Plank. He has said he wants not only to provide a signature corporate campus for his fast-growing company but also to remake the image of his adopted hometown. We don't doubt he hopes to profit from the venture, but that doesn't appear to be his sole or even primary motivation. Moreover, the scale of the Port Covington plan — a $5.5 billion development expected to take decades to complete — sets it apart. With most developments, the question is how to mitigate the impact on surrounding neighborhoods. This one is big enough to warrant discussion of its potential impact on the whole city.