BOSTON ( TheStreet) -- It's no secret renters have been feeling the crunch of a competitive rental market for a few years now. If it seems like rent increases have been unusually high this year, though, that's because they are. In June, the real estate data firm Trulia ( TRLA) analyzed the rent prices in 25 of the largest rental markets in the United States. What they found is an average annual increase of 3.9%. This figure is a huge increase when compared with inflation or income growth. Generally speaking, incomes are not keeping pace with rent increases, putting renters in an even tighter position. According to Trulia, the five least-affordable rental markets in the country are New York City, Miami, Los Angeles, San Francisco and Boston, all of which seemed to charge rents making up close to or more than half of a renter's average monthly wage. The cities that experienced the highest rent hikes for 2012-13 were Houston, Miami, Boston, Tampa-St. Petersburg, Fla., and San Diego. Some cities, such as Houston, Texas, had lower rents to begin with than the national average for major cities, whereas others were raised from already higher-than-average rates. For instance, Boston -- already one of the most expensive cities in the country -- saw a 5.5% increase in rents this year. It would seem the recent rent increases are an enduring ripple effect of the foreclosure epidemic that catalyzed the Great Recession, flooding the market with prospective renters. At the same time, the gradual economic recovery has resulted in rising employment rates. With a shortage of available rentals, landlords are in the enviable position of being able to name their price and have their pick among desirable tenants willing to pay it.
In particular, Seattle experienced a large rent increase this past year despite a projection that 12,000 rental units will be added to the market by the end of the year. Portland, which also experienced an impressive increase in average annual rents, did so even as 4,000 units were added in the city. In fact, Portland saw its occupancy rate jump a full percent this past year. San Francisco, which has also added thousands of units recently, saw an occupancy rate increase of 1.2%. "So far, it appears aggressive rent hikes and new construction hasn't had a negative impact on occupancy rates," according to the RealFacts report. Though there seems to be no signs of rent increases slowing down, the report warned that the market will soon become oversupplied: The increased availability of new rentals, coupled with the rise in interest rates, will eventually lead to a downturn in the rental market. Additionally, more people will turn to buying as an affordable alternative. That's because even though home prices rose 7% in the last year, outpacing rent increases, the gap between buying and renting is still quite large.