The option notice went out on time and was still rejected as late

The system showed a deadline, the notice went out before it, and the landlord has written back refusing it as out of time. Nothing failed in the way people expect: the alert fired, somebody read it and somebody acted. What failed is either the date the system computed or the proof that the notice was served in the manner the lease requires, and those are different problems with different fixes.

Work out which before anyone drafts a reply. An arithmetic failure means the abstract is wrong and probably wrong across the portfolio. A delivery failure means the abstract was right and the process around it was not. Treating one as the other is how a fixable position becomes an argument nobody can win.

Recompute the deadline with the lease open and the abstract closed

1. Assemble the operative document set: the executed lease and every amendment, side letter and assignment. The abstract is the artefact under suspicion, so it takes no part in this.
2. Quote the anchor the option clause actually names. Write it down verbatim rather than paraphrasing it, because paraphrase is where anchors get swapped.
3. Record the unit and the count: months or days, business or calendar, and whether the count includes the anchor day itself.
4. Compute both ends of the window. Most option clauses are two-sided — no earlier than one date, no later than another — and a notice can be refused as premature.
5. Apply the notices clause to your actual dispatch to get a deemed date of receipt, then compare that with the window close rather than comparing the postmark.
6. Check the address and the method against the notices clause as amended, not as originally executed.
7. Compare the result with what the system displayed, and record the difference as a finding whichever way it goes.

1 hour of this on 1 lease settles the question, and it usually settles it against the abstract. It is the same discipline that resolves an indexed increase that came out wrong: recompute from the clause, in isolation, before anyone argues about the output.

6 dates a window can count back from, and only 1 is in the abstract

The commencement pair is the most productive place to look. Where a lease carries separate term and rent commencement dates, a fit-out period of 3 to 9 months separates them, and a window counted from the wrong one is wrong by exactly that gap — enough to swallow a 6-month notice period whole.

Business days, calendar days, and the month with 28 in it

A period expressed in months is not a period in days. Counting 6 months back from 31 August lands on a date that does not exist in February, and different conventions resolve that differently — last day of the month, or the corresponding day in the following month. A period expressed in business days needs a holiday calendar, and the relevant calendar is the one for the place of service rather than the place your finance team sits.

Sending is not serving, and the clause usually says so

This is the cause that catches teams who did everything else right. Notices clauses commonly deem a notice received a stated period after dispatch, varying by method — same day for personal delivery, some number of business days for post, and separate treatment for anything sent outside business hours. Under that wording the dispatch date is simply not the operative date, so a notice posted 2 days inside the window can be deemed received after it closed.

The practical consequence for a system is that a reminder must fire against the last safe dispatch date, computed backwards from the window close through the deemed-receipt period for the method you actually intend to use. A reminder set on the deadline itself is telling you to act on the day it is already too late to act.

A method the lease does not accept, on a notice that plainly arrived

Notices clauses enumerate permitted methods, and a notice served another way can be refused even where everyone agrees it arrived and was read. Email is the recurring problem: many older leases do not list it, some list it only for routine communications and exclude notices exercising rights, and some require it to be followed by a hard copy. A courier is not registered post. An acknowledgement from someone who is not the addressee is not service on the addressee.

• Copy requirements are conditions, not courtesies. Where the clause requires a copy to named counsel or to a lender, omitting it can invalidate the notice itself.
• The address in the abstract may have been superseded. Notices clauses usually allow a party to change its address by notice, and that superseding notice sits in correspondence rather than in the lease.
• Landlord identity changes on sale. Serving the entity named in the lease after the building has been sold is a real and common failure.
• A window can also have closed earlier than the abstract says, because an amendment shortened it or moved the expiry. That kind of unrecorded amendment is the same root cause behind a rent roll that does not tie to the leases.

The reminder is not the control. The control is a date you can re-derive from the clause, and evidence that service happened the way the clause requires.

The first 48 hours, before the argument starts

1. Preserve everything now: courier tracking, delivery receipts, the exact document sent, email headers with timestamps, and the record of who sent it.
2. Re-serve immediately if any reading of the clause leaves the window open, by every permitted method at once, and without waiting for the dispute to resolve.
3. Get it in front of someone with authority the same day. A rejection sitting unread in a shared mailbox for 6 days is the routing failure described in routing a lead to the person who can actually answer, with a deadline attached.
4. Tell finance. If the option is genuinely lost, the lease term underpinning the accounting changes, and the inputs that feed it are set out in producing a straight-line rent schedule from an abstract.
5. Take legal advice on the position. This page is about how the date is computed and evidenced, which is a different question from whether the notice was effective.

What a correct recomputation still leaves open

Recomputing the date tells you whether you were inside the window. It does not tell you whether the notice was effective, whether the landlord has waived anything by conduct, or whether a court would read the clause the way either party does. Nor does it recover a window that has genuinely closed — at that point the question becomes what the tenancy costs while a new arrangement is negotiated, which is set by the holdover clause and the base its multiplier applies to.

What it does settle is whether the portfolio has the same fault everywhere. If the anchor was wrong on this lease, re-derive every option date in the estate from its clause and expect to find more, which is the work the rest of the lease administration topic exists to prevent. Building a register that stores the rule rather than the answer is scope we take under MVP and product builds for property teams.

• lease administration
• option notices
• critical dates
• commercial leases