The Negotiation Email Writer

Help me write this negotiation message in writing.

The situation: [WHAT STAGE, WHAT I'M CONVEYING — OFFER, COUNTER,
PUSHBACK]
The recipient and relationship: [DESCRIBE]
My goal for this message: [DESCRIBE]

Provide:
1. A message that advances my position while keeping the tone
   constructive
2. How to make my ask or counter clearly and justifiably
3. What to put in writing vs save for a conversation
4. How to leave room to maneuver rather than boxing myself in
5. A close that keeps momentum toward a deal

Written negotiation lacks tone and feedback — help me be clear, firm, and
relationship-preserving, and avoid anything I wouldn't want quoted back.