Getty Images DOWNEY — The Downey City Council on Tuesday will consider approving a development funding agreement intended to bring a Costco warehouse and gas station to Firestone Boulevard. The agreement involves the city, Costco Wholesale Corp., Downey Nissan, Andrews Rancho del Norte and Andrews Rancho del Sur. It lays out a two-phase plan that would first relocate Downey Nissan to a new site across Firestone Boulevard, then clear the way for Costco to build on the former All American Home Cen