CHICAGO, NOV. 29 -- People lined up in drizzly weather again today to pay their respects to the late Mayor Harold Washington at the city-county building, following the steps of more than a half-million other mourners.

Washington, who died Wednesday of a heart attack, will be buried Monday at Oak Woods Cemetery on the city's South Side.

The city-county building was opened to mourners Friday afternoon. Portia McCaskill, the city's special events coordinator, said more than 500,000 people paid their respects Friday and Saturday. At 9 a.m. today, 2,000 mourners were in line.

"I never dreamed there would be as many people here for as long a period, consistently night after night," said Ernest Barefield, Washington's chief of staff.

Barefield walked among thousands of visitors shaking hands and exchanging hugs.

The city declared Monday an official day of mourning. Most public buildings will be closed. Public schools will be open for morning memorial services but classes will be dismissed early.

Dignitaries from across the nation are expected at the funeral at Christ Universal Temple, including Democratic presidential contenders Sen. Paul Simon (Ill.) former governor Bruce Babbitt of Arizona and Sen. Albert Gore Jr. (Tenn.).