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The latest big donor to the future Pérez Art Museum Miami won’t have a named wing or even a modest plaque memorializing the gift.

In a public announcement shrouded in secrecy, the Miami Art Museum said Friday that an anonymous donor had pledged $12 million in cash and $3 million in art.

Still and possibly forever unclear: how exactly the gift came about, whether the giver has an established relationship with the museum, what the donated art is and why the benefactor wants to remain anonymous.

The gift, among the largest yet to the institution, was announced to a crowd of more than 350 at the annual corporate luncheon held at the Mandarin Oriental, Miami.

Now just months away from completion, the Herzog & de Meuron-designed museum overlooking Biscayne Bay has been in serious fundraising mode for years. A general obligation bond approved by Miami-Dade voters in 2004 provides for about $100 million in public money, the largest single contribution to the project.

Museum officials have a total budget of $220 million for construction, transition costs and an endowment.

Chris Sabian is a portrait artist with http://www.kutefineart.com and owner of http://www.paragonprints.co.uk