Finally, last year, a significant number of affordable units began going up.

You can't just say, this town has to provide 300 or 400 affordable units.

The law requires that affordable units remain so for 30 years.

The state has set a goal of 284 affordable units for the town.

Buyers of the affordable units will have incomes in the middle $30,000 to low $50,000 range.

It worked out to give Warren a figure of 367 affordable units.

Under the existing law, affordable units go to the market rate after 30 years.

General Atlantic plans to build 700 affordable units on the site over the next two years.

"You wouldn't have seen those affordable units built without the 421a program," he said.

By the completion of the development pipeline in 2010, over 2,000 new affordable units will have been created.