Mark McDonald, a spokesman for Mayor Nutter, said the initial interest in the buildings was encouraging.
"It's a little early to say anything definitive about . . . what the net could be to the School District," he said. "But the administration and the mayor are pleased with the significant response that has come in so far."
City Council President Darrell L. Clarke, who pushed for the sale of buildings, said he still had concerns about the district's process. He has said repeatedly that the district has done a poor job selling real estate and should turn the job over to experts.
He noted that 21 of the 28 buildings were not being offered for sale. For those, the district sought "expressions of interest" that were not formal offers and would not be "the opening of negotiations," according to the district website.
"The process that was laid out . . . by the School District," Clarke said, "was not consistent with the sense of urgency the district had this summer about the need for revenue."
In August, Superintendent William R. Hite said classes would not start on time unless the city pledged $50 million toward the district's $304 million deficit.
Schools eventually opened as scheduled, but Nutter and Clarke spent months haggling over the best way to provide the money.
Nutter wanted to follow the outlines of a state plan that called for the city to borrow the money against future collections of the city's extra 1 percent sales tax.
Clarke and his colleagues coalesced around the idea of giving the district the money in exchange for school buildings that could be sold to repay the city.
Among other objections, Nutter said he did not want the city to become responsible for the upkeep of another collection of large, aging buildings.
He and members of his administration also were skeptical that properties could be sold quickly enough to raise that much money.
They noted that the district tried to sell a dozen buildings in 2012, but received just nine offers worth $11.8 million.
In October, Nutter agreed to a compromise that hinged on selling at least $61 million worth of buildings by June 30 - covering the $50 million the city had pledged, as well as the $11 million the district already had budgeted in 2014 from selling off property.
The district would retain control of the properties, which would be sold with the help of the city's Commerce Department and the Philadelphia Industrial Development Corp.
If the district failed to sell enough buildings, the city would cover the difference from a $50 million pool of money Council authorized in the fall.
To spend that money, however, the city would have to follow the outlines of Clarke's plan and enter into an agreement to take control of empty schools to be sold through the Philadelphia Authority for Industrial Development.
Two of the schools listed for expedited sales - University City High School and Charles Drew Elementary - sit on the same plot near Drexel University and likely would be sold together. They constitute the district's most valuable available real estate.
Allan Domb, president of the Greater Philadelphia Association of Realtors, has predicted that University City and William Penn High School, on North Broad Street near Temple University, could generate more than $50 million combined.
But William Penn is not one of the schools offered for expedited sale. Gallard said William Penn did not meet the two factors necessary - "demonstrated significant interest and [being] available for quick disposition."
He said he could not elaborate.
The district received 18 expressions of interest on properties in the pool of 21 that included William Penn, he said.
It's also unclear whether any offers were made for the entire portfolio. In October, a Washington real estate investment firm, Municipal Acquisitions, made an unsolicited $100 million offer for all the shuttered buildings.
The firm's chief executive, Jon Kling, was on vacation last week and could not be reached, according to his office.
A Philadelphia-based firm that also made an unsolicited bid in the fall, Alterra Property Group, eventually decided against pursuing an offer.
The company's cofounder, Leo Addimando, said Alterra previously bought a building from the district after an 18-month process.
"For us to get involved in another process, it's a lot of effort," he said. "Things in our world need to move quickly."
BY THE NUMBERS
Number of vacant schools.
for "expedited sales."
Amount of money
the School District needs to raise by selling the buildings.
Amount city had pledged in expectation of building sales.
Amount the School District had budgeted for property sales beyond the $50 million pledge.