The real estate broker is the one totally responsible and should the only one sued by both parties: the developer should sue them for the cost they paid for property and construction of the building, the property owner should sue for any current increase in property taxes & costs of removing the building if she so chooses. If she chooses to keep the building she sues for one years taxes only. The developer has no right to the building they built on her property, only the right to sue the broker.
no she should NOT have to pay for removal of th building