Base Offering Circular - Multifamily 482090 57 Standard Abbreviation Category of Class Definition PZ Partial Accrual A Class on which interest accrues during any Accrual Period and (a) a portion of such accrued interest is added to its principal amount on each Distribution Date and is not distributable as interest thereon until a later date or the occurrence of a specified future event, and (b) simultaneously, the Class receives distributions of the remainder as interest.  The interest that accrues on such Class but is not distributed to such Class is distributed to certain Accretion Directed Classes or other Classes as principal. WAC WAC (or Weighted Average Coupon) Classes whose Interest Rates represent a blended interest rate that may change from period to period. WAC Classes may consist of Components, some of which have different interest rates. Z Accrual Accrual Classes accrete all of their interest; that is, the interest is added to the outstanding principal balance of the Accrual Classes. This accretion may continue until these Classes begin receiving principal distributions, until some other event has occurred or until these Classes are retired. The interest accrued on the Accrual Classes may be distributed to certain Accretion Directed Classes or other Classes as principal. OTHER TYPES IMD Increased Minimum Denomination Classes to be offered and sold in higher minimum denominations than those of other Classes. SP Special Classes having characteristics other than those identified above.