The Falls Church City Council, culminating a nearly two-year process, Monday night adopted a streetscape plan for Broad Street, or Rte. 7, that calls for new and wider sidewalks and extensive landscaping along the road, including planting about 300 trees.

The plan is part of a $16 million project to reconstruct, and in some places widen, a mile-long stretch of Broad Street from Haycock Road to Fairfax Street. The city and the Virginia Department of Transportation have agreed to rebuild the stretch, which serves as the main thoroughfare in Falls Church and comprises the city's central business core.

Mayor Carol W. DeLong said the council felt it was under some pressure to complete a streetscape plan because the transportation department is expected to hold a public hearing on the road project this fall.

"These things can drag on too long if there are not some deadlines, and in this case, we sort of self-imposed a deadline so we would have something to give the highway department that could be presented to the public at the hearings," DeLong said.

In areas where the road is being widened to five lanes, the transportation department has agreed to pay 95 percent of the cost to reconstruct the street, build concrete sidewalks and plant trees. But it is still negotiating with the city on the amount it will pay for additional landscaping and more expensive sidewalk material, such as brick.

"The city hopes that by having an approved streetscape plan, the transportation department will include {those} improvements in its plan . . . and in its share of the expenses," Planning Director Henry Bibber said.

The council was presented a streetscape proposal last December by an eight-member citizens advisory group headed by City Council member Gary Knight. The council established the committee in the fall of 1985 to suggest improvements in the appearance of Broad Street. In addition to suggestions of widening sidewalks and planting trees and shrubs, the committee recommended building brick sidewalks, replacing street lights, adding crosswalks and installing new benches and trash cans.

Since its original presentation, the streetscape plan has been reviewed by professional landscape architecture firms as well as citizens and has undergone revision by the city's planning commission and city staff.

The plan adopted this week calls for red oak, London plane and willow oak trees to be planted along the road in landscaped beds near the street curbs.

The plan also calls for new concrete sidewalks with a brick design in most areas. However, it calls for all-brick sidewalks along a four-block stretch from Little Falls to Fairfax streets, the historical center of city.

City officials agree that a key conclusion from the last eight months of debate is the decision to hire a professional landscape architecture firm to assist city planners and transportation department officials in coordinating and implementing streetscape improvements.

The conclusion that a firm should be brought in is shared by many citizens, including members of the Planning Commission and the Village Preservation & Improvement Society.

Bibber said the city soon will begin soliciting applications for a firm, and he predicted that the city would hire an architect within the next several months.

Also included in the streetscape plan is a commitment by the city to work to minimize disruption to businesses during the reconstruction of Broad Street. Economic Development Coordinator Dave Cardwell said city officials, for example, will make every effort to maintain traffic flow along Broad Street during the construction period.

"One of the most important things in terms of phasing is to maintain adequate traffic flow to support businesses," he said. Bibber predicted that reconstruction of Broad Street could begin in late 1988 and be completed by 1992.

Meanwhile, DeLong believes the two years the city has spent designing the streetscape plan and revising it has been well spent.

"I think it was very useful, and I've got to say I think it's the Falls Church way," she said.