How can I convince my postdoc advisor to end my contract early? I am currently a postdoc in a Computer Science discipline.
By some odd artifact of the way our university handles postdoc contracts, we are given fixed-duration (1 year) contracts with no exit clause. The only way to amend the contract (i.e. end it early) is through a mutual agreement with the advisor.
(Side note: this came as a nasty surprise to me when I started looking for jobs.)

I have found a job that is a great career opportunity for me, and I intend to take it as I believe it's acceptable to leave my postdoc early.
The job is in industry (again, my choice), and while I would much prefer to not burn any bridges I understand this is a lot to ask of my boss.

I am personally aiming for the smoothest transition possible, 
with a reasonable notice period (1.5 months) and a plan for transitioning my duties, but obviously this mutual agreement issue is a big sticking point.

I am looking for good arguments to help my case, ideally focusing on the positive (it's great for them), for example:


it looks good on their "CV" to have lab members go to great places
This increases their visibility in the community
people are defined by where they've worked previously, this can increase the reputation of the lab


What arguments can I use to convince my postdoc advisor that we should end the contract early?
I realize there are many "legal" reasons why I can/should be allowed to leave, and I would have posted on workplace.sx to look for those.
My hope here is to look for some of the often-intangible "academic" benefits, and take a step in the direction of a win-win compromise.
Just explain your situation to your advisor.

Say that you are sorry to leave and explain why the new opportunity is great for you.

You do not need to come up with reasons why you leaving early is great for your advisor. (It isn't, but they will understand.)

Advisors worry about your future.