The deal on a new Vancouver City Hall is set to close today, and over the next year, city officials will begin to plan for their new digs, and also craft evacuation plans for their old ones.The city is consolidating its administrative employees into the former Columbian building at 415 W. Sixth St., which it snapped up this month for $18.5 million, leaving behind five locations. The consolidation will save about $1 million in leasing and operating costs starting in 2011, Vancouver Chief Financial Officer Lloyd Tyler said.Three buildings are leased, and will go back to the building owners when leases expire. But what will be done with two others, the current City Hall and a building near Esther Short Park, isn’t yet clear.Vancouver owns its vintage-1966 City Hall at 210 E. 13th St., but not the land it’s on. That belongs to Vancouver Public Schools, which leases it to the city for $1 a year.At its facility at 610 Esther St., the city is in a lease-to-own agreement with nonprofit community development organization National Development Council. The buildings aren’t needed for administrative employees — they’ll all fit in the first four floors of its new six-story building for at least the next 12 years. The full 118,000 square feet is expected to last for the next 40 years.