The City is pushing for more Accessory Dwelling Units on O'ahu.

As an incentive, Honolulu Mayor Kirk Caldwell announced new tax-breaks Thursday.

To date, there's been more than 700 applications for ADU's and 444 of them have been approved. 170 total projects have been completed.

The Mayor wants to stimulate more construction and he claims there's about 100,000 properties on the island where they could be built. 

"I tell you if we built a hundred thousand ADU units we would really tackle our affordable housing in a really easy way where government is not buying buildings and building buildings its the private sector responding to the market and through regulation building and addressing our affordable housing challenges," Mayor Caldwell said.

According to the City, with the recent completion of the Kailua-Kaneohe Sewage Tunnel, more than 4,000 properties in Kaneohe could now qualify for ADU's.

More than 160 applicants in that area were already denied because of sewer capacity, however the City wants them to reapply.

The new incentives are worth about $11,000.