Denver Nuggets and Colorado Avalanche team president Josh Kroenke on Tuesday morning signed a deal that ties those franchises to Ball Arena and the land around it through 2050 — just hours after the City Council gave key approvals for a massive redevelopment on the site. In signing a revised agreement with Denver Mayor Mike Johnston, the Kroenke family added 20 years to their legal commitment to the city. It came at a time when sports owners and municipal officials regularly have knock-down, drag-out fights over financing for stadiums, and even teams with decades of history in their cities, like the Oakland Athletics, are willing to decamp for communities willing to pony up more dough.