It wasn’t much of a surprise to learn who the top ten taxpayers are in Somerville for fiscal year 2011.

In fact, the list has been fairly steady for the past three or four years, said Chief Assessor Marc A. Levye who also serves as chairman of the Board of Assessors.

“There isn’t tremendous variation from year to year,” he said. “The list can certainly change, but it’s usually that number 10 moves to 11 or a similar exchange of places.”

This year’s top ten taxpayers are:

1. Assembly Square Mall: Federal Realty Assembly Square LLC, 133 Middlesex Ave., for $1,328,255.04
2. NSTAR: NSTAR Electric Company, private property, for $1,214,342.28
3. Twin City Plaza: Twin City Plaza, 22 McGrath Highway, for $1,162,447.99
4. Assembly Square/Retail: I-93 Somerville LLC, 75 Mystic Ave., for $763,560
5. Assembly Square/Retail: Federal Realty Sturtevant St. LLC, 123, 74, and 85 Foley St., for $761,262.96
6. Telecommunications company: CRP (CoreSite Data Center) 70 Inner Belt LLC, 70 Inner Belt Road, for $716,388.96
7. Office building (housing Harvard Vanguard, etc.): Kadima Medical Properties LLC, 40 Holland St., for $680,582.24
8. Commercial building (housing Planet Fitness, etc.): National Tax Search LLC Trustee, 5 Middlesex Ave., for $525,378.06
9. NSTAR: NSTAR Gas Company, private property, for $418,180.60
10. Commercial building (housing Citizen’s Bank, etc.): Davis Square Real Estate, 212 Elm St., for $408,313.71

These 10 commercial properties collectively pay $7,978,711.84 in taxes, which is approximately 8 percent of Somerville’s entire levy for FY 2011. The money they owe the city comprises 30 percent of the total commercial tax dollars.

Somerville’s total tax levy for 2011 is $100,575,528. Of that amount, commercial properties paid $26,941,576 (approximately 26.7 percent) and residential property owners paid $73,633,952 (a little over 73 percent).

The top 10 have to pay the taxes–in quarterly installments–but are always allowed to appeal, said Levye. The deadline for appeals is Tuesday, Feb. 1.

Corporate taxpayers who appeal usually site reasons such as over-valuation, Levye said.

In such cases, Levye reviews the application, looking at sales or special circumstances, and then the Board of Assessors makes the decision.