The short answer
A commercial tenancy is usually a chain of documents, not one lease. To keep the terms straight, maintain a current-state abstract per tenancy that is rebuilt whenever the chain changes, applying two rules: later documents override earlier ones for the specific terms they address, and silence never erases a term. Every value in the current state should cite the document and page that controls it, because in a dispute the question is never what the summary says, it is which language governs.
How chains drift out of memory
The original lease is signed with care and read by everyone. The first amendment extends the term and gets skimmed. The second restates rent and adds an option, and by then the deal lives partly in documents and partly in the memory of whoever negotiated it. Staff change, buildings sell, and the chain becomes a box that no one has read end to end.
The two rules of chain reading
Rule one: a later document controls the terms it explicitly addresses. If the second amendment restates base rent, that schedule governs, whatever the original said. Rule two: silence preserves. If an amendment says nothing about the renewal option, the option survives exactly as written. Most chain-reading errors are violations of rule two, terms assumed dead because the newest document did not mention them.
A defensible current state
The goal is an abstract you could hand to a lender, a buyer, or your own attorney and defend line by line: this is the rent, from this document, this page. This is the option, still alive, from the original, unmodified since. When each value carries that provenance, diligence stops being an archaeology project.
Bring one lease. Watch it get read.
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