Thank you all your responses. It appears that you're all warning me to NOT go through with the proposal to have BitPay process this payment. As a result, I'm going to suggest sending the payment direct and the buyer can subsequently sell and withdraw.
Which US exchange provides the quickest on boarding process that includes creating an account, verifying, adding US bank account AND requesting a withdrawal limit increase to $150k? How long is this whole process likely to take on the quickest exchange?
Thanks again.
Trading a block of that size might justify using a reputable OTC trading desk. I would recommend
itBit or
Kraken. In general, if he wants to
immediately withdraw a sum that large, he will need the highest level of verification on any exchange. He should be prepared to verify ID, proof of residence, SSN and selfie (if located in the US), and probably a KYC questionnaire about occupation/source of funds.
Coinbase Pro has enough liquidity to dump 16-17 BTC easily enough, but they saddle new users with a $10,000/day withdrawal limit. They will automatically increase it to $50,000/day after regular usage and they can also
manually increase your limits upon request, but I've heard of people having problems getting their limits increased:
https://www.reddit.com/r/CoinBase/comments/7psxpa/over_usd_500000_stuck_on_coinbase_withdrawal/