(a) Class set-aside for construction under the Real Estate Owned Program. A class set-aside is hereby made for each proposed procurement for construction under the Real Estate Owned Program with an estimated cost of less than $1,000,000. Accordingly, Contracting Officers shall set aside for small business each such proposed procurement. If a Contracting Officer determines that any individual procurement falling within the class set-aside requirements of this Section is unsuitable for such a set-aside in part or in total, the set-aside may be withdrawn with the concurrence of the Head of the Contracting Activity. Proposed procurements for construction which exceed an estimate of $1,000,000 shall be considered for set-aside on a case-by-case basis.