Saint Paul condominiums, and the city's tallest building, Wells Fargo Place (formerly Minnesota World Trade Center), were constructed in the late 1980s. In the 1990s and 2000s, the tradition of bringing new immigrant groups to the city continued. As of 2004, nearly 10% of the city's population were recent Hmong immigrants from Vietnam, Laos, Cambodia, Thailand, and Myanmar. Saint Paul is the location of the Hmong Archives. Geography Saint Paul's history and growth as a landing port are tied to water. The city's defining physical characteristic, the confluence of the Mississippi and Minnesota Rivers, was carved into the region during the last ice age, as were the steep river bluffs and dramatic palisades on which the city is built. Receding glaciers and Lake Agassiz forced torrents of water from a glacial river that served the river valleys. The city is situated in east-central Minnesota. The Mississippi River forms a municipal boundary on part of the city's west, southwest, and southeast sides. Minneapolis, the state's largest city, lies to the west. Falcon Heights, Lauderdale, Roseville, and Maplewood are north, with Maplewood lying to the east. The cities of West Saint Paul and South Saint Paul are to the south, as are Lilydale, Mendota, and Mendota Heights, across the river from the city. The city's largest lakes are Pig's Eye Lake, which is part of the Mississippi, Lake Phalen, and Lake Como. According to the United States Census Bureau, the city has a total area of , of which is land and is water. The Parks and Recreation department is responsible for 160 parks and 41 recreation centers. The city ranked #2 in park access and quality, after only Minneapolis, in the 2018 ParkScore ranking of the top 100 park systems across the United States according to the nonprofit Trust for Public Land. Neighborhoods Saint Paul's Department of Planning and Economic Development divides Saint Paul into seventeen Planning Districts, created in 1979 to allow neighborhoods to participate in governance and use Community Development Block Grants. With a funding agreement directly from the city, the councils share a pool of funds. The councils have significant land-use control, a voice in guiding development, and they organize residents. The boundaries are adjusted depending on population changes; as such, they sometimes overlap established neighborhoods. Though these neighborhoods changed over time, preservationists have saved many of their historically significant structures. The city's 17 Planning Districts are: Sunray-Battle