LONDON--Art work and office buildings are being sold by bankruptcy receivers for the Espirito Santo group of companies that collapsed last year amid fraud allegations.

The 36-story Espirito Santo Plaza in Miami went on the block in April after Luxembourg officials managing the bankrupt companies hired Florida's EXAN Capital to manage the sale. The office and condominium tower, located in Miami's Brickell Avenue financial district, is expected to fetch at least $120 million based on market prices.

The proceeds of the sale will go to creditors of Espirito Santo International SA, the top holding company of the former Espirito Santo empire that spanned banking, real estate, health care and energy, and its subsidiaries. Espirito Santo Plaza had been owned by Florida-registered Estoril Inc., part of Espirito Santo International subsidiary Rio Forte Investments SA.

Espirito Santo International also put up for sale a set of paintings at Christie's in Paris last month. According to Christie's website, paintings offered by multiple sellers including the Espirito Santo International estate raised EUR2.98 million ($3.18 million) on March 30. A spokeswoman for Christie's said she couldn't provide a breakdown by seller.

Portugal's Espirito Santo family spent decades building a global network of financial and industrial companies under patriarch Ricardo Salgado. The group started to collapse last spring when the Bank of Portugal appointed auditors to review Espirito Santo International's accounts and found irregularities. A tangle of cross-funding across the group unraveled, leading to the August failure of the group's prize asset, Banco Espírito Santo SA.

Banco Espírito Santo's failure is under investigation by the Bank of Portugal, the country's markets regulator and the prosecutor's office, which has opened probes for suspected money laundering and fraudulent practices.

Other assets up for sale across the insolvent group include several real-estate projects in Brazil, and a 66% stake in real-estate developer Property Brasil SA, according to documents on the receivers's website.

The Luxembourg court-appointed receivers haven't publicly said how much the group companies held in assets and liabilities at the time of their collapses. They also haven't indicated what the ultimate outcome for creditors might be. Alain Rukavina, receiver for ESI and Rio Forte, didn't immediately respond to requests for comment.

The sales come as other Espirito Santo creditors have taken legal action in the U.K. and Portugal over repayment. This week, New Zealand's Superannuation Fund and several other funds filed a claim in Portugal against Novo Banco SA, the "good bank" carved out of Banco Espírito Santo, over a loan made by a Luxembourg investment vehicle to the Portuguese bank. The New Zealand retirement fund, holding notes backed by the loan, is questioning the legality of a decision by the Bank of Portugal to keep the loan in the rump "bad bank" of Banco Espírito Santo where it is unlikely to be repaid.

A Novo Banco spokesman declined to comment.

Junior bondholders in Banco Espírito Santo have also filed lawsuits in Portugal and in the European Union's general court over actions by Portuguese and European Union authorities in the bank's August breakup.

Write to Margot Patrick at margot.patrick@wsj.com

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