After seven hours of talks it was announced that they had signed a peace agreement.
Osborne said that "real progress" had been made during 10 hours of talks.
Owners and players met again on October 18-20 for 30 hours of talks over three days.
On November 26, after 15 hours of talks, a tentative deal was reached.
After more than 12 hours of talks on Sunday, an American official said a deal was almost in hand.
Nearly 10 hours of overnight talks could not produce an agreement between all member states.
It came after almost five hours of talks last night in City Hall.
But in the last 72 hours of talks, he agreed to finance it privately.
The agreement came after more than 11 hours of talks that began Monday.
The more than three hours of talks between the two leaders produced no breakthrough proposals.