It's called mortgage fraud and it is punishable by up to 30 years in federal prison, $1,000,000.00 fine or both.
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If the mortgage lender is a federally insured institution, it is federal crime to lie on a mortgage application. Even in a private mortgage situation, it would still be fraud and might subject the borrower to both criminal and civil liability.
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It seems to me that both the person creating the fake lease and the person posting this question had a good feeling the act is illegal. As suggested it is best if you do not post questions regarding these matters in an open forum such as this.
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