What is a promissory note in conjunction to real estate? A promissory note is the promise to repay the amount that is borrowed in order to purchase the real property, or if you’re taking a loan out against the real property. So, you have the note, which says you promised to repay the loan and sets forth the terms, the interest rate of the loan. The note is then secured by a mortgage, which puts a lien against the real estate. Now, this the mortgage doesn’t say that you owe me any money. The note says that what the mortgage does is gives the lender at lien against the property. So, if you don’t make the payments on the promissory note, they can enforce or foreclose on the mortgage and have your property sold at foreclosure sale. If you do not pay the amount owed to them on the promissory note, if you have any questions, give me a call at (727) 847-2288.