"First deed of trust" or "first mortgage" includes all deeds of trust and mortgages, and amendments thereto, that are made by the same grantor or mortgagor, secure notes held by the same holder, convey substantially the same real estate, and are superior to all other deeds of trust or mortgages on the real estate.
"Grantor" or "mortgagor" includes an owner of real estate, and spouse, who has assumed responsibility for the obligation secured by such deed of trust or mortgage encumbering the real estate.
"Real estate" includes a leasehold estate of not less than 25 years.
Va. Code § 6.2-409