The Bellevue City Council approved an interlocal agreement and memorandum of agreement Monday with fellow stakeholders in the Puget Sound Emergency Radio Network to proceed with plans to replace the aging system.

Project director David Mendel said the King County Council is still reviewing the levy lid lift measure for the estimated $275-million replacement project — including financing — and must make a decision by March 3 to place it on the April 28 special election ballot.

If the measure makes it to the ballot and is approved, the estimated cost to county residents is 7 cents per $1,000 of assessed property value over nine years, or about $35 a year.

The regional radio system is owned by four entities, including the city of Seattle, King County, Valley Communications Center in Kent and the Eastside Public Safety Communications Agency, which holds interlocal agreements with the cities of Bellevue, Redmond, Kirkland, Issaquah and Mercer Island.