New, multimillion-dollar fraternity and sorority houses line the streets at the University of Alabama, and more are under construction.

Records provided to The Associated Press by the university show that Alabama's Greek-letter social groups have undergone a $202 million building boom over the past decade. About 30 houses have been built or are on the table. One planned sorority house tops $13.5 million.

A study shows the boom gives the university the largest U.S. Greek system by membership.

The school's Greek system has been embroiled in controversy this fall, and some worry the construction shows wealthy social groups are only getting more powerful.

But the school says the houses provide needed bed space as enrollment increases. Officials say the construction represents only a fraction of total building costs on campus.