A letter from acting Nassau County Assessor James Davis that was expected to resolve disputes over the share of revenue the county would receive from a Glen Cove waterfront redevelopment has instead raised more questions.

Legislators delayed an Aug. 1 vote on a City of Glen Cove proposal to allocate $21.3 million to the county over 40 years from the Garvies Point waterfront project so the assessment office could determine the typical allocation for the county. The meeting will reconvene at 3 p.m. Monday in the legislative chamber.

The $21.3 million is 6.4 percent of the total payments in lieu of taxes from the development, less than what the county typically would receive. Legislators say they want to know the typical revenue the county would receive from the development, and know how much money the county would be agreeing to forgo if the legislature approves the proposal to accept $21.3 million.

Davis said the typical percentage is 7.7 percent. But it is unclear whether that number refers to the proportion the county receives from all projects in Glen Cove or whether it refers to the amount the county typically would receive from a project such as Garvies Point.

The Garvies Point number is not easily calculated because the development would include condominiums, which usually are taxed in Glen Cove at one rate, and rental housing, stores and offices, which are taxed at a different rate.

Davis could not be reached for comment to clarify his letter, but he is scheduled to speak at Monday’s meeting, said Brian Nevin, spokesman for county Executive Edward Mangano.

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Legis. Delia DeRiggi-Whitton (D-Glen Cove) said Davis’ letter is confusing and does not outline how he arrived at the 7.7-percent figure, which she said appears to be too low.

She called for another postponement of a vote.

“We’re still deciphering which numbers are correct . . . ,” she said. “We need to have the facts before we vote, and I don’t believe we do.”