You are correct in your analysis that "the signing of the estoppel may make all the forbearances and abatements null and void" if they are not detailed in the estoppel certificate.
An "estoppel certificate" concerning your lease is your written statement that defines and describes your leasehold interest so that the lender and/or other parties contemplating taking an interest in the property will be informed about the nature and extent of your interest.
Although you are not a party to the transaction between the landlord and the lender, the purpose of an estoppel certificate is to make you aware of the reliance of the lender on it. Accordingly, you would be "estopped" from asserting matters different from those appearing in the certificate as against the lender or its assignees upon completion of the transaction.
A certificate of estoppel can be viewed as a tenant's warranty as to the terms of a lease., It enables the lender to estimate the cost of ousting or keeping a tenant. In the event of litigation you cannot contradict the certificate's contents, having once warranted them as true.
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