(Updated at 1:20 p.m.) Real estate assessments for numerous Clarendon restaurants skyrocketed this year, with little explanation as to why.

Long-time businesses, which have not been renovated or sold recently, saw their assessments increase by double digit or even triple digit percentages. The rise in assessments could mean the owners will be forced to pay tens of thousands in additional county taxes this year, barring a successful appeal.

The biggest increase spotted by ARLnow.com was that of Rien Tong Restaurant (3131 Wilson Blvd). The Asian eatery, located across from the Clarendon Metro station, saw its assessment jump from $559,900 to $1,667,600, a nearly 200 percent increase that would result in an extra $12,528 in taxes.

The assessment for Kabob Bazaar (3133 Wilson Blvd), directly adjacent to Rien Tong in a nearly identical storefront, also increased but not as dramatically. The restaurant’s assessment increased from $635,500 to $840,700, a 32 percent rise.

The biggest tax increase as a result of higher assessments goes to Spider Kelly’s (3171 Wilson Blvd), which saw its property valuation increase 83 percent to $5.1 million. The added tax yearly bill: $26,428.

With the exception of Revolution Cycles (2727 Wilson Blvd), which had its building assessment increase 64 percent to $3.8 million, and Azure Day Spa (2420 Wilson Blvd), which increased 55 percent to $1.9 million, the businesses impacted were primarily Clarendon restaurants.

Other big increases include Eventide (39 percent), Clarendon Ballroom (50 percent), Hard Times Cafe and Delhi Club (50 percent), Boccato Gelato (71 percent), Whitlow’s (24 percent), Faccia Luna and Boulevard Woodgrill (56 percent). By comparison, the Clarendon Whole Foods store at 2700 Wilson Blvd saw no increase in its assessment.

Several restaurant owners contacted ARLnow.com about the higher assessments.

“There’s some funny business going on here,” one said, on the condition of anonymity. “This is a money grab, pure and simple.”

Arlington County Director of Communications Diana Sun says that the businesses in question are typically assessed based on a method that takes a look at the income generated by each property. That, however, can’t fully explain the increases.

“Clearly there were some that just look like an anomaly,” she said.

Sun encouraged business owners who think their assessments this year were unjust to file an administrative appeal before the March 3 deadline. Such an appeal could result in a new inspection of the property and a lower assessment. After March 3, or after an unsatisfactory result from an administrative appeal, any appeals must be filed with the county’s Board of Equalization.

The unknowns involved in filing an appeal still have some business owners on edge.

“I have to hire a lawyer now,” one told ARLnow.com “I’m pretty pissed off about it.”