A partnership between Miami developer Michael Stern and Italian investor Gianluca Vacchi that once promised a $4 billion pipeline of new developments is imploding amid dueling lawsuits alleging fraud, broken promises, and reputational damage. The legal battle, detailed in newly filed court records, has ensnared some of Miami’s most high-profile projects, including Mercedes-Benz Places Miami and the Dolce & Gabbana-branded 888 Brickell tower.
Stern, founder and CEO of JDS Development Group, teamed up with Vacchi in 2024. Their joint venture was slated to invest in a portfolio of new developments that included Mercedes-Benz Places in Brickell, the Dolce & Gabbana-branded 888 Brickell, a 1250 West Avenue project in Miami Beach, and a planned buyout of the Casablanca condo-hotel, also in Miami Beach. Of those, only two remain under Stern’s ownership: Mercedes-Benz Places and 888 Brickell, both of which are now facing separate lawsuits including a foreclosure action.
Vacchi first sued Stern and related LLCs in December, alleging he orchestrated a “deliberated and calculated fraud” over a $2.5 million investment in the Casablanca property. In a new lawsuit filed in early July, Vacchi expanded his claims, alleging that Stern violated state law and defrauded him into investing at least $60 million into two Miami developments. Vacchi and four of his companies accuse Stern of running what amounts to a Ponzi scheme, misrepresenting the state of projects, and diverting investments intended for one development to another. Vacchi also alleges that Stern violated a settlement agreement the two parties reached earlier in 2026.
According to Vacchi’s complaint, Stern convinced him in 2024 to invest $25 million in the Dolce & Gabbana project at 888 Brickell, another $30 million in the Mercedes-Benz project, and $2.5 million in the Casablanca proposal. Vacchi said he made an additional $5 million investment into Mercedes-Benz to complete the sales center on time, help pay for opening events, and stabilize the project for a few months. Under the settlement agreement, Stern allegedly agreed to pay Vacchi’s entities $42.5 million, guaranteed by JDS Development Group. Vacchi is now seeking to have Stern removed from the Mercedes-Benz project entirely.
Stern has fired back with his own legal action, alleging that Vacchi’s original complaint is “not only a fraud” but also “an abuse of the legal system” filed “for the sole purpose of maliciously creating reputational destruction” and to extract a settlement. Stern alleges that Vacchi repeatedly failed to meet his capital obligations due to an apparent lack of liquidity, a complete lack of business experience, and a chaotic organizational structure. Stern’s complaint also alleges that Vacchi failed to disclose KYC and compliance risks prior to their partnership, including a prior criminal conviction in Italy. Stern claims the damages from Vacchi’s allegations amount to at least $500 million, in part tied to the collapse of the Casablanca deal and broader reputational harm.
The Mercedes-Benz Places project, a stalled 791-unit, two-tower development partially built in Brickell next to Southside Park, has been wrapped up in a foreclosure lawsuit brought by the developer’s new lender, Cottonwood Management. Cottonwood alleged that the developer failed to repay the loan by the January 2025 maturity date, while a JDS affiliate countersued, accusing Cottonwood of underhandedly acquiring the note while JDS was in the market for a construction loan. An affiliate of JDS is now working to rescue the project, nearing a deal to bring on Jeff Soffer’s Fontainebleau Development and secure an over $1 billion loan package that includes a C-PACE component, with BDT & MSD Partners and Blackstone as lead lenders. That deal has not yet closed.
The 888 Brickell project, a 250-unit Dolce & Gabbana-branded condo-hotel, faces its own challenges. In May, One Sotheby’s International Realty, the brokerage firm hired to lead sales and marketing, sued the JDS affiliate behind the tower, seeking more than $500,000 in allegedly unpaid commissions, expense reimbursements, marketing fees, and other costs. The developer is reportedly in the process of securing new debt for the project.
The 1250 West Avenue project in Miami Beach has already moved beyond Stern’s involvement. Ownership was transferred to developer David Martin of Terra, with Stern replaced in a consent to change control granted by the city and recorded earlier in 2026. That development is planned for the site next to Monad Terrace, a luxury condo tower that Stern and JDS completed in 2021.
The unraveling of the Stern-Vacchi partnership highlights the risks inherent in Miami’s fast-paced, capital-intensive development market, where projects frequently rely on complex financing structures and international investor relationships. With Mercedes-Benz Places valued at more than $2 billion upon completion, according to court filings, the stakes in the legal dispute extend far beyond the individual parties to encompass the future of some of Miami’s most ambitious developments.
Sources: The Real Deal South Florida, The Real Deal – Vacchi v. Stern Fraud Allegation, The Real Deal – Soffer/JDS Loan Deal, The Real Deal – Sotheby’s v. JDS
