In any private sale confined to the parties, the property, if divided into purparts, shall be offered for sale both in purparts and as a whole to determine which will bring the greater price. No sale of the whole shall be confirmed unless the amount bid equals or exceeds the valuation of the whole fixed by the court. No sale of any purpart shall be confirmed unless the amount bid for such purpart equals or exceeds its valuation as fixed by the court. The award and allocation to the successful bidder shall be made subject to the payment of owelty where required.