http://www.FDIC.gov/regulations/laws/rules/6000-1700.html
6000 - Bank Holding Company Act
Subpart G—Appraisal Standards for Federally Related Transactions
§ 225.63 Appraisals required; transactions requiring a state certified or licensed appraiser.
(a)
Appraisals required. An appraisal performed by a state certified or licensed appraiser is required for all real estate-related financial transactions
except those in which:
(1) The transaction value is $250,000 or less;
(2) A lien on real estate has been taken as collateral in an abundance of caution;
(3) The transaction is not secured by real estate;
(4) A lien on real estate has been taken for purposes other than the real estate's value;
(5) The transaction is a business loan that:
(i) Has a transaction value of $1 million or less; and
(ii) Is not dependent on the sale of, or rental income derived from, real estate as the primary source of repayment;
(6) A lease of real estate is entered into, unless the lease is the economic equivalent of a purchase or sale of the leased real estate;
(7) The transaction involves an existing extension of credit at the lending institution, provided that:
(i) There has been no obvious and material change in market conditions or physical aspects of the property that threatens the adequacy of the institution's real estate collateral protection after the transaction, even with the advancement of new monies; or
(ii) There is no advancement of new monies, other than funds necessary to cover reasonable closing costs;
(8) The transaction involves the purchase, sale, investment in, exchange of, or extension of credit secured by, a loan or interest in a loan, pooled loans, or interests in real property, including mortgaged-backed securities, and each loan or interest in a loan, pooled <A name=fdic611022>loan, or real property interest met Board regulatory requirements for appraisals at the time of origination;
(9) The transaction is wholly or partially insured or guaranteed by a United States government agency or United States government sponsored agency;
(10) The transaction either:
(i) Qualifies for sale to a United States government agency or United States government sponsored agency; or
(ii) Involves a residential real estate transaction in which the appraisal conforms to the Federal National Mortgage Association or Federal Home Loan Mortgage Corporation appraisal standards applicable to that category of real estate;
(11) The regulated institution is acting in a fiduciary capacity and is not required to obtain an appraisal under other law;
(12) The transaction involves underwriting or dealing in mortgage-backed securities; or
(13) The Board determines that the services of an appraiser are not necessary in order to protect Federal financial and public policy interests in real estate-related financial transactions or to protect the safety and soundness of the institution.