Societe Generale will launch its first solo single-borrower securitization next week.The offering will be backed by a senior $210 million portion of a $410 million floating-rate loan it originated this month on a repositioned mixed-use building on Manhattan’s Far West Side. The 464,000-square-foot property, at 787 11th Avenue, is owned by a partnership between Georgetown Co. of New York and the family of hedge-fund operator Bill...