Mayor Mufi Hannemann and the Kapolei Property Development Co. are expected to announce today a $172 million partnership to build major new roads and other infrastructure for the burgeoning "second city" in West O'ahu.

The announcement is to be made across from Kapolei Hale, the city's government services building on Ulu'ohia Street, and near a site being eyed by the city for a transit center.

Kapolei Property Development is a subsidiary of the James Campbell Co. LLC, the successor company to the Estate of James Campbell, the major landowner, master planner and developer of the Kapolei area.

Details of the plan were being withheld until today's announcement.

Besides roads, the infrastructure projects are expected to include sewer pipes, drainage ways, water lines and other needed improvements the company would pay for to speed development of the area.

The work is expected to be spread throughout Kapolei on parcels that are not necessarily contiguous.

Shad Kane, chairman of the Makakilo/Kapolei/Honokai Hale Neighborhood Board, said he had not yet been informed of the impending announcement but was pleased at the amount of money being discussed.

"If that is correct, that's an extraordinary amount of money to be investing in the area and I think it would solve a lot of things that our community is very much concerned about," Kane said. "I think it will make a lot of people happy."

Infrastructure issues take center stage at nearly every one of this board's monthly meetings, Kane said.

Earlier this year, the state Legislature appropriated $55 million of additional funding for the North-South Road/Kapolei Parkway, which is projected to be completed in summer 2009.

Added investment in Kapolei will help solidify the area as the second city envisioned by planners decades ago.