NIU VALLEY — Honolulu Waldorf School can go ahead with plans to build a two-story high school building on its Niu Valley campus, but it must limit the number of students, air-condition the new building and add more on-site parking, the city said.

Those and other conditions issued Friday were part of the city's approval of the school's request for a conditional use permit to build a high school on its K-8 campus on Ulua Street.

Residents who had voiced concerns about the proposed school expansion said the conditions imposed on the school are realistic and show that the city Department of Planning and Permitting heard residents, many of whom packed a public hearing last month.

"The conditions are based up on what the community has asked for over and over again," said Marty Plotnick, a Niu Valley resident. "The school can't come in and bully the neighborhood in the name of education."

The private school, which has been at 350 Ulua St. for more than 40 years, has 230 students enrolled in preschool through eighth grade. The proposal is to build a two-story, 10,000-square-foot building on the southwest corner of the campus.

The new high school will have 80 to 100 students, said Connie Starzynski, school administrative director. Construction could begin in 2008, the estimated cost is about $5 million and it would be built in an environmentally friendly manner, the school has said.

A note went home with students to families yesterday, Starzynski said. The conditions imposed by the city are very doable, she said.

"We're very pleased with the decision," Starzynski said. "We just have to go through the details with our architect and consultant."

Among the other conditions imposed: