For the ADHD readers in the audience, I’ll condense it down: convince your boss why it’s good for the company, and not what benefit you’ll be taking from the arrangement. If you can help it, don’t even mention what’s in it for you. A few notable advantages that may interest your boss:
Lack of offices and cubicles for new hires.
Increasing employee productivity.
Attracting and retaining valuable employees.
Increasing billable hours.
Being environmentally friendly.
Expense of employee parking.
And, unless you’re an incredibly valued and irreplaceable employee, never threaten to quit if s/he doesn’t acquiesce to your demands. You may just get your wish, albeit with no preparation, and you don’t want to be unemployed with little to no cash reserve, scrambling to figure out what your next move’s going to be.