Developer Paul Lee Sweeny asked Fairfax County officials for zoning changes this week that would allow him to build a 16-acre, one-million-square-foot office, hotel and residential development adjacent to the Vienna Metro station.

Sweeny is seeking approval for a 23-story hotel, two 12-story office towers, two 10-story office buildings, a seven-story apartment building and 15 town houses.

The Sweeny proposal is the second major mixed-use bid for hotel and office towers near the Vienna station, which is scheduled to open in mid-1986 at the end of Metro's Orange line. Last December, Hazel-Peterson Cos. filed plans for its 61-acre Virginia Center, a complex that would include a 28-story office tower.

The Sweeny site and the Hazel-Peterson site are on opposite sides of the I-66/Metrorail corridor. The Hazel-Peterson tract is on the north side of the station area, near the Towns of Moorefield and Country Creek town-house developments along Nutley Road.

The Sweeny proposal, as yet unnamed, would be built south of the Metro station and Interstate 66, wedged between the transit line and the Circle Woods town-house development. The Sweeny property is east of Blake Lane and abuts Blake Lane Park. The site is west of Fairlee, a single-family residential area whose homeowners this past summer sold their properties en masse to Lincoln Property Co. of Dallas, one of the nation's leading residential and commercial developers.

Like the Hazel-Peterson application, the Sweeny proposal is certain to stir neighborhood opposition to its planned height and density. Hazel-Peterson officials recently bowed to protests and lowered the height of their proposed 34-story tower to 28 stories. Approval of either or both projects would be expected to change the Vienna area dramatically.

County planning officials said they were surprised by the density and height requested in the Sweeny proposal, but said they would not judge the project until it is studied by the Vienna Metro Station Task Force, a group of citizens, developers and business leaders. The task force is preparing recommendations for development of all land inside the station study area.

Access to the Sweeny site would be along the planned extension of Circle Woods Drive, according to the conceptual development plans that the developer filed in the county planning office.

Those plans call for about one million square feet of space, including 674,600 square feet of office space and 10,000 square feet of retail space. Among the buildings:

*A 23-story, 600-room hotel to be built near the Metrorail station and I-66.

*Two 12-story, 140,000-square-foot office buildings with more than 1,000 parking spaces.

*Two 10-story, 202,000-square-foot office buildings with more than 1,450 parking spaces.

*A seven-story, 110-unit apartment building.

*Fifteen three-story town houses.

The Vienna Metro Station Task Force, which will make its recommendations to the Fairfax County Planning Commission, is waiting for additional information from the Virginia Department of Highways and Transportation on the impact of various development plans on I-66 before making any decisions, county planners said. No date has been set for final action by the task force.

The planning commission then will hold public hearings on those recommendations before the Fairfax County Board of Supervisors holds it public hearings and eventually adopts a development plan for the Vienna Metro station area.

Sweeny is asking the county to grant him planned development commercial zoning for the land, which now is zoned for single-family residential development. Task force members are expected to recommend some change in the current land-use plan for the area. Hazel-Peterson's Virginia Center plan calls for 6 office buildings, 2 hotels, 2 residential towers and 44 town houses.