For a Streamlined Rate Lock Mortgage Loan trade with the Multifamily Trading DeskMultifamily Trading DeskTeam that quotes interest rate pricing for a Mortgage Loan and can be contacted at (888) 889-1118. , your ability to increase the Mortgage LoanMortgage LoanMortgage debt obligation evidenced, or when made will be evidenced, by the Loan Documents, or  a mortgage debt obligation with a Fannie Mae credit enhancement. Rate LockRate LockAgreement between you and the Investor containing the terms of the Lender-Arranged Sale or Multifamily Trading Desk trade of the Mortgage Loan and the MBS terms and conditions relating to the underlying MBS, if applicable, which may be documented via a recorded telephone conversation. amount.