The renovation, designed by E. Timothy Marshall & Associates of Highland Park, N.J., may be completed this year.
Tomorrow, its Park Avenue headquarters will reopen after a renovation designed by the architect Bartholomew Voorsanger.
He said the mission has raised $526,000 toward the renovation, designed by Diffendale & Kubec of Staten Island.
They have undertaken a $6 million renovation, designed by HLW International, and are asking rents around $55 a square foot annually.
The Smithsonian Institution's National Museum of American History reopened on Nov. 21 after a two-year, $85 million renovation designed by Skidmore, Owings & Merrill.
The renovation, designed by the British architect Norman Foster, is to be financed with $150 million from the city, proceeds from the sale of the two libraries and private donations.
MoMA's 2004 renovation, designed by the Japanese architect Yoshio Taniguchi, increased the museum's gallery space, but the museum said it still needs more room for exhibitions.
The library's renovation, designed by the British architect Norman Foster, is planned for the area now occupied by stacks so would not affect the Rose Reading Room.
The $67 million renovation, designed by the architect Thomas Leeser, added three stories, nearly doubling the size to 97,700 square feet from 50,000.
After a $7 million renovation, designed by Jamie Drake and paid for privately through the Gracie Mansion Conservancy, the four principal downstairs rooms exude a sumptuous Second Empire formality.
