Accordingly cases cited by defendants in which the purchasers are shown to have known at the time of the contract that the land bargained for had an actual value greatly in excess of the contract price are not in point. While defendants have proved hardship in the sense that they would realize substantially more in a sale of their property at its present market value rather than at the option price, a modern court of equity cannot force a party to renegotiate a contract for the sale of land solely in the light of changes in land values occurring after the date of the contract, Sinclair Refining Co. v. Miller, D.C.S.D.N.Y., 106 F. Supp. 881; Cities Service Oil Co. v. Viering, 404 Ill. 538, 89 N.E.2d 392, 13 A.L.R.2d 1448; 49 Am.Jur., Specific Performance, ยง 64, p. 78 and Annotation, 11 A.L.R.2d 390, at page 406 Compare Glenn v. Tide Water Associated Oil Co., Del. Ch. , 101 A.2d 339, in which it was held that mere inadequacy of consideration does not in itself justify a denial of the right of specific performance. Despite comments as to what constitutes hardship justifying denial of specific performance in cases such as Willard v. Tayloe, 8 Wall. 557, 19 L.Ed. 501; Godwin v. Collins, 3 Del. Ch. 189, aff.