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Aurora, Colorado Springs and Denver all are reporting some of the fastest rent increases in the country, according to a new rental price monitor from Apartment List.

Apartment List, a digital platform for rental properties, surveyed rental listings in 100 cities across the U.S., primarily those with the largest populations, to measure changes from October 2013 to October 2014. Of the three Colorado cities included in the survey, all made the top 10, with Aurora landing at No. 1.

One-bedroom rents rose 11.5 percent in Aurora, and two-bedroom rents were up 10.4 percent the past year. Denver ranked fourth among cities with a 6.5 percent annual increase in two-bedroom rents and fifth for a 6.6 percent jump in one-bedroom units.

Colorado Springs had the seventh-fastest increase in one-bedroom rents at 5.6 percent and the sixth-fastest in two-bedrooms at 5.9 percent.

Nationally, rents rose 2.4 percent for one-bedroom apartments and 3.2 percent for two-bedroom apartments.

“It is all supply and demand,” said Craig Maraschky, executive director of the Aurora Housing Authority. “Hopefully, things will calm down as more units come online.”

In-migration and job growth have boosted demand for apartments, and developers have responded with a surge in multifamily construction. But new projects need to charge monthly rents of $1 to $1.25 a square foot to cover their costs, Maraschky said.

Investors are also buying up older buildings and renovating them, pushing up rents. At the same time, federal tax credits to support construction of affordable units remain constrained, and funding for federal vouchers to help lower-income families afford rents has remained flat.

Max Rosett, a data scientist at Apartment List, said Aurora isn’t alone among Denver suburbs experiencing sharp rent increases.

Centennial, Littleton, Westminster, Thornton and Lakewood, although too small in population to make the top 100 cities, all saw rent increases running above 9 percent.

The differential for those willing to live outside Denver isn’t small change. A renter could save more than $2,500 a year taking a one-bedroom apartment in Aurora versus Denver, Rosett said.

As those who can’t afford to live in Denver city limits look elsewhere, the added competition pushes rents everywhere higher.

Denver’s median one-bedroom rent of $1,040 a month ranked as the 12th-most- expensive among the 100 cities studied, while the average two-bedroom rent of $1,380 ranked 11th.

Aurora rents still remain in line with the rest of the country. Median rents in Aurora were $830 a month for a one-bedroom apartment versus a national median of $850. Two-bedroom units went for $1,120 versus the U.S.median of $950, according to Apartment List.

Colorado Springs remains a comparative bargain, with one-bedroom apartments at a median of $660 a month and two-bedrooms at $850 a month.

Among the most affordable apartment markets studied were Fort Wayne, Ind.; Toledo, Ohio; and Wichita. At the other extreme were San Francisco, New York City, Washington, D.C., and Boston. A two-bedroom apartment in San Francisco, at the average rent, goes for nearly eight times what a two-bedroom in Fort Wayne costs.

Aldo Svaldi: 303-954-1410, asvaldi@denverpost.com or twitter.com/aldosvaldi