Corporate and other donors have pledged $45 million so far.
Four donors have pledged to raise $2 million for the building.
Many donors have pledged much more than the $2,500 a ticket.
More than a year ago, foreign donors pledged a five-year aid package of $2.5 billion.
In other cases, donors have pledged or sent money that has not been processed.
The fund is seeking $3.5 billion for 2005 projects, he said, but so far, donors have pledged only $900 million.
The World Bank and international donors pledged $5 billion last year.
In a separate meeting, donors pledged $940 million for Lebanon.
At an international conference last week, donors pledged $360 million in development assistance over three years.
So far, donors have pledged enough money to cover about 60 percent of the need.