Agreement with mutual releases. The foundation wall, now erected, shall be and remain forever the division line between the two properties and _________ and _________, his wife, release and quitclaim to _________, her heirs and assigns, any and all right and title which they now have to any portion of the land or of the foundation wall now constructed between the two properties, and _________ and _________, her husband, hereby release and quitclaim to _________, his heirs and assigns, any and all right, title or claim to the land lying south of the line of the foundation wall. _________ and _________, her husband, for the consideration previously mentioned, also grant and convey to _________, his heirs and assigns, the right to use the wall to be erected on the foundation wall between the two properties as a party wall with the right also to build into and on wall to a depth of _________ inches.