13 CFR § 107.1410 - Requirement to redeem 4 percent Preferred Securities.
You must redeem 4 percent Preferred Securities not later than 15 years from the date of issuance. At the redemption date, you must pay to SBA:
(a) The par value (of preferred stock) or face value (of a preferred limited partnership interest); plus
(b) Any unpaid dividends or partnership distributions accrued to the redemption date.