 In 2006, PNC and Rohr have received high marks for their decision to sell a 49.8 percent stake of the money manager firm BlackRock to Merrill Lynch in 2006.The deal valued PNC's 70 percent stake at $5.6 billion, compared to the $240 million PNC, under O'Brien had paid for the same stake in 1995.In 2007, PNC acquired Mercantile Bankshares Corporation, headquartered in Baltimore, adding 240 branches, primarily in Maryland, Delaware and the District of Columbia.