The defendant Deland, in his capacity as trustee, in 1905 executed a note for $17,000, payable in three years to the plaintiff, which was secured by a mortgage upon real estate in Boston. Before the maturity of the note the mortgagor conveyed the real estate to Nellie H. Miller by a deed referring to the mortgage, which the grantee therein agreed to assume and pay. The defendant as mortgagor straightway thereafter notified the plaintiff as mortgagee by letter of the sale and of the assumption of the mortgage by the grantee. When the note matured, the mortgagee advised the grantee that, if she desired an extension, $2,000 must be paid on the principal and the rate of interest would be increased. A formal extension agreement under seal was signed by both parties, wherein the mortgagee agreed to extend the time for the payment of the principal for three years until 1911, and the grantee agreed to pay the principal at that time and to pay the increased rate of interest. The grantee did not pay the principal,. nor the interest, nor the taxes after 1914. In 1916 the mortgagee foreclosed the mortgage and received for the sale of the real estate $11,000. This was its fair market value, it having depreciated markedly since 1908. This suit is brought to recover from the mortgagor the balance due upon the note.
The judge has found that the agreement for extension was executed by both the mortgagee and the grantee and went into effect on its execution. This finding cannot be reversed and must stand. It appears that the agreement for extension was drafted in duplicate, each copy identical with the other except that the acknowledgment clause upon one was in form for the grantee and upon the other for the mortgagee. They were drafted by the attorney for the grantee and submitted to the mortgagee, who approved their form. Both then were signed by the grantee, but neither was acknowledged by her because of illness. Both then *346were signed by the mortgagee, whose acknowledgment was taken and certified upon the one designed for that purpose, and he then returned both copies to the attorney for the grantee. That attorney tried to get her acknowledgment and wrote her several times to come to his office for that purpose. She never came, after-wards left Boston and is reported to be in Austria. The clerk of the mortgagee endeavored repeatedly to get one copy of the agreement with the acknowledgment of the grantee, and was informed that the papers were mislaid or lost. Both copies remained in the possession of the attorney of the grantee.
These facts and the inferences which reasonably may be drawn therefrom warrant the conclusion that the agreement for extension was executed by both parties thereto without condition and was delivered. The circumstance that the copy of the agreement intended to be kept by the mortgagee was not acknowledged by the grantee is not decisive. Acknowledgment was not necessary to its validity. Both copies were signed by each party. Apparently the delivery was absolute. There is nothing in the record which required a finding or ruling that they were intended to take effect only upon acknowledgment by the grantee of the copy arranged for that purpose or upon any other condition. The case of Diebold Safe & Lock Co. v. Morse, 226 Mass. 342, relied on by the mortgagee, is plainly distinguishable in this particular.
The extension agreement between the grantee and the mortgagee, without the knowledge and assent of the mortgagor, bars the present suit against the latter. It was held in Rice v. Sanders, 152 Mass. 108 that, when a grantee in a deed assumes and agrees to pay a mortgage on the property conveyed, he takes upon himself the burden of the debt or claim secured by the mortgage and as between himself and his grantor he becomes the principal-and the latter merely a surety for the payment of the debt. The mortgagee is not bound by such an agreement unless he assents to it. But when, with knowledge of such an agreement, he enters into an independent stipulation on his own account with the grantee, whereby he obtains a new obligation running directly to himself on the footing that the grantee becomes principal, then in the absence of special conditions he is held to have recognized and become bound by the relation of principal and surety existing between the mortgagor and the grantee. By the agreement with *347the mortgagee in the case at bar the grantee agreed to pay the debt and she became the principal debtor. It follows that the agreement for extension of time of payment given to the grantee operated to discharge the mortgagor as original debtor, now become surety. The fact that the agreement to pay the debt and to grant extension of time for payment were embodied in the same instrument is immaterial in this connection. The case is governed by Franklin Savings Bank v. Cochrane, 182 Mass. 586, North End Savings Bank v. Snow, 197 Mass. 339.
Shepard v. May, 115 U. S. 505, is distinguishable because in that case there was no immediate agreement (as there is in the case at bar) between the mortgagor and his grantee that the latter would assume and pay the debt to the mortgagee. The point adjudged in Keller v. Ashford, 133 U. S. 610, while not the same here presented, is not at all at variance with our conclusion. As is pointed out in Union Mutual Life Ins. Co. v. Hanford, 143 U. S. 187, that decision rests upon the local law of the State of Illinois, which differs from that of this Commonwealth and of the United States courts upon the vital point whether the mortgagee may sue at law a grantee who by the conveyancé to him has assumed the payment of the mortgage debt. Such direct action is not allowed under our decisions. Mellen v. Whipple, 1 Gray, 317. Coffin v. Adams, 131 Mass. 133. Creesy v. Willis, 159 Mass. 249. That .principle marks an important distinction in the application of the relation of principal and surety to a mortgagor and his grantee with reference to the mortgagee; but it has no pertinency to the facts here disclosed.
1 It follows that the order dismissing the bill with costs was right.
Decree accordingly.