The proceedings authorizing any revenue bonds under this subchapter or any financing document securing the revenue bonds may provide that if there is a default in the payment of the principal of or the interest on the bonds or in the performance of any agreement contained in the proceedings or financing document, the payment and performance may be enforced by mandamus or by the appointment of a receiver in equity with power to charge and collect rents, purchase price payments, and loan repayments, and to apply the revenues from the nonprofit facility in accordance with the proceedings or provisions of the financing document. Any financing document entered into under this subchapter may also provide that if there is a default in the payment thereof or a violation of any agreement contained in the financing document, the nonprofit facility may be foreclosed and sold under proceedings in equity or in any other manner now or hereafter permitted by law. Any financing document may also provide that any trustee under the financing document or the holder of any revenue bonds secured thereby may become the purchaser at any foreclosure sale if it is the highest bidder.