Conn. Gen. Stat. § 3-46: Reappraisal of securities.

The Treasurer shall cause to be examined and reappraised all the real estate securities held by him at least once in five years, and for such purpose may appoint such persons as he chooses to make such examination and reappraisal; and, when in any instance it is found that there has been a depreciation in the value of any security, the Treasurer shall call in such an amount as will leave the security worth double the amount of the loan or, in the case of residential property, fifty per cent more than the amount of the outstanding principal balance; provided, if such appraisal is not of double value or fifty per cent more, as the case may be, but sufficiently exceeds the principal balance of the loan and the property is well maintained as determined by the Treasurer and the interest upon the same has been promptly paid, the Treasurer may consider the security upon such loan to be ample. The Treasurer shall keep a record of such reappraisals.