When a surge of confidence sweeps through the Street, it's usually propelled by the momentum of deals that exceed expectations. SL Green Realty Corp (NYSE:SLG), New York City’s largest office landlord, ignited the wave on Monday, with its shares climbing nearly 20% after it announced a strategic sale and partnership. What Happened: SL Green announced the sale of a 49.9% stake in the 245 Park Avenue location to a U.S. affiliate of Mori Trust Co. Ltd, valuing the asset at $2 billion. The sale foll