Non-PRO English to Spanish Law/Patents

el Blacks Law dice: "A clause commonly inserted in mortgages and deeds of trust, giving the mortgagee or trustee the right and power on default in the payment of the debt secured to advertise and sell the mortgaged property at public auction (but without resorting to a Court for authority), satisfy the creditor out of the net proceeds, convey by deed to the purchaser, return the surplus, if any, to the mortgagor and thereby divest the latter's estate entirely and without any subsequent right of redemption" pero no sé cómo se dice en español...

El power of attorney dice:
12)From time to time if and when the Attorneys shall think fit to sell, exchange, surrender, give up, mortgage, charge, demise, lease or dispose of any houses, offices, buildings, lands, or hereditaments of any tenure or any chattels or effects belonging to or held by the Corporation for such consideration and subject to such covenants exceptions and restrictions as the Attorneys shall think fit and to transfer, release or otherwise deal with any mortgage or securities whether upon real or personal property to which the Corporation may be entitled and also to execute and enforce any powers of sale or other rights powers or remedies incident to any such mortgage charges or securities as aforesaid or otherwise release and obtain the benefit thereof in such manner as the Attorneys shall think better.