Flatiron Real Estate Advisors has landed a $34.8 million loan to refinance a 12-property multifamily portfolio in Williamsburg, Brooklyn, Commercial Observer has learned.Bank of Montreal (BMO) supplied the loan, which retires past debt from the portfolio’s previous lender, Oritani Bank, which was acquired by Valley National Bank in 2019. The 92 apartments in the 12 buildings are a mix of free-market and rent-controlled units acquired by Flatiron in 2005.