Request additional fees when an architecture or engineering client changes scope

Help me write an additional services request for a design project where the client has changed or expanded the scope. Project and contract form: [e.g. "office fit-out, owner-architect agreement based on a standard industry form", "civil site design, our own contract"] Contracted scope and phase status: [e.g. "Design Development approved; now in Construction Documents"] What changed and who asked: [e.g. "owner added a second-floor mezzanine after DD approval" - with date and how it was requested] Contract language on additional services: [PASTE the relevant clause, or "none"] Work required: [redesign, re-coordination with consultants, code review, re-submittal to the permitting authority, model and sheet updates] Effort estimate: [hours by role, consultant fees, reimbursables] Schedule impact: [DAYS or WEEKS] Relationship context: [e.g. "good client, sensitive about budget"] Produce: 1. A short cover email asking for written authorization before we proceed. 2. The additional services request: the change described factually, the reference to the contract clause and the approved phase it reopens, work included and excluded, fee (lump sum or hourly not-to-exceed), consultant fees with markup, schedule impact, and an approval signature block. 3. A note on what to do if the client asks us to start before signing (e.g. a written interim authorization). 4. Talking points for a phone call if the client pushes back, separating true changes from work within our original scope. Use only my numbers and clause text; mark gaps [ADD]. Have someone familiar with the contract confirm the clause reference before sending.