Local politicians are lining up against Donald Trump’s 45-story hotel condo in SoHo after a Web site for the project indicated that primary residences would be for sale, an alleged sidestep of zoning laws.

The former parking lot on which the building could soon rise lies in a manufacturing district, an area in which residential development is prohibited, with only transient hotels allowed.

The president of Manhattan, Scott Stringer, in a letter signed by Rep. Jerrold Nadler, state Senator Tom Duane, and Assemblywoman Deborah Glick, is asking the city’s Department of Buildings to hold off on approving any additional construction permits.

“He’s busted,” Mr. Stringer said in a telephone interview yesterday. “You say you will operate it as transient hotel, and at the same time you are marketing it as a residential building? That’s unconscionable.”

The permits were expected to be issued soon, following the determination that the proposed hotel condo would qualify as “transient.” With hotel condos, buyers have the right to reside in their unit for a certain number of days a year and then rent it out the rest of the time.

The speaker of the City Council, Christine Quinn, in a separate letter expressed “outrage” and said Mr. Trump and the property’s other developers “appear to be acting disingenuously.” The office of Ms. Quinn, who represents the district, had negotiated a voluntary restrictive declaration with the developers that would limit the number of days a year that owners could reside in their units.

On the Trump SoHo Web site yesterday, a questionnaire for potential buyers asked whether the unit would be used as a primary residence, secondary residence, or investment property. Following press inquiries, the Web site was changed. In addition, elected officials say promotional brochures feature kitchenettes, which they call a “residential amenity.”

The owners of the site, on the corner of Spring and Varick streets, are Bayrock Development, the Sapir Organization, and Zar Realty Management, who are partnering with Mr. Trump. Construction on the 413-unit building, with an outdoor heated pool and private cabanas, is expected to end in 2009.

A spokesman for the developers, Julius Schwarz, said Trump SoHo would contain guest rooms, not primary residences. He said the “error”on the Web site was corrected as soon as it was brought to the developers’ attention.

“This was a form error on the sale questionnaire attached to the site and we regret any confusion this may have caused,” Mr. Schwarz said.

“Please also note that our guest rooms will contain only those types of amenities which one would typically expect to find in luxury style hotels,”he said.”We expect all hotel room users to take advantage of Trump SoHo’s white glove, full-service restaurant, 24-hour room service, bars, and lounges.”

Trump SoHo would be the tallest building in the low-rise neighborhood between Midtown South and the top of the financial district, and some area residents have complained that it is completely at odds with the neighborhood’s low-rise character and will worsen the permanent traffic jam leading up to the Holland Tunnel. Supporters say it will enliven a dead stretch of Varick Street and attract tourists.

The project marks the first time that a developer has proposed to build a condo hotel in a manufacturing district. Local elected officials fear that Trump SoHo could set off a wave of hotel condo development in the city’s fragile manufacturing zones, which have recently transformed into desirable residential neighborhoods. Some preservationists point to a recent building sale in the fashion district’s manufacturing zone as evidence that the trend is spreading. They are seeking to ban hotel condos altogether from manufacturing areas.

Over the last year and a half, one of the developers, Zar Realty, has paid more than $150,000 to Constantinople Consulting, the lobbying firm of a former speaker of the City Council, Peter Vallone Sr. On behalf of the developer, the firm lobbied the buildings department, the planning commission, the City Council, the office of the Manhattan president, the office of the attorney general, and the office of the deputy mayor, according to filings with the state.

A spokeswoman for the buildings department said the commissioner did not receive the letter from Mr. Stringer yesterday.