A letter of intent is an agreement(s) between two or more parties before an actual agreement, such as a lease, is finalized. It is similar to a term sheet or memorandum of understanding (MOU). While LOIs may not be binding, provisions of them can be, e.g., non-disclosure and exclusivity. The intent is to protect both parties in the transaction until the transaction is executed.
Learn more at https://www.naiop.org