Taking the top spot, The Ambassador condos in the heart of the Gold Coast had a median sale price of $4,176,667 in 2015. The vintage brick building's big sales knocked the Waldorf Astoria out of the top spot for the first time in the last four years.

Coming in at a respectable second place is the Residences at 900. The Gold Coast building gained three places this year with a median sales figure of $3.55 million — a notable boost from the $3.125 million it witnessed in 2014.

In a surprise upset, the Waldorf Astoria has been bumped to the third place on the list of priciest residential buildings. According to sales data, the building had a median sale figure of $3,462,500 in 2015. The building had held the title as Chicago's priciest for the last four years, but its reign has come to an end (for now).

Like the Waldorf Astoria, the Gold Coast's Park Tower is a mainstay of Chicago's ultralux offerings. The 70-story tower falls from third to fifth place this year with a median sales figure of $2.6 million.

30 West Oak had a pretty incredible year in 2014, becoming the city's second priciest residential building. However, 2015's median sale price of $2.596 million reduces it to sixth place on this past year's list.

1347 N State is another newcomer to the list for 2015. The two-unit building witnessed big enough sales to land it on the list of 2015's priciest buildings. One unit sold for $1.275 million last May while the larger unit fetched $3.3 million in April. This brings the building's median sales figure to $2,287,500.

Located next door to 840 N Lake Shore Drive, The Belvedere is also positioned next to its neighbor on the list of priciest buildings in Chicago. Buyers spent a median of $2.195 million for units last year.

The final building on the list also brings us under the two million dollar mark. The Drake Tower on Lake Shore Drive had a median sales figure of $1.999 million last year.