William O. Diab
Partner
William O. Diab is a Partner on the firm's Dispute Resolution Team and Construction Law practice. William prides himself on being a strategic problem solver of complex commercial and construction disputes. For clients who want their day in court, William has tried bench and jury trials to successful verdicts as lead counsel. He has experience representing publicly traded and closely held companies, entrepreneurs, and investors, as well as Court appointed fiduciaries in matters concerning distressed transactions and corporate malfeasance. He also routinely represents real estate developers in multi-party construction defect and delay cases, as well as discrete construction frauds. William has appeared in a variety of forums including state and federal courts, bankruptcies, and arbitrations in national and multi-jurisdictional disputes.
Outside of court, William advises real estate developers on structuring their construction and development plans. He marshals a thoughtful understanding of the risks and variables that compose a construction project and the roles of each essential player to negotiate the matrix of contractual relationships between the developer, contractor, architect, engineers, subcontractors, sureties, insurers, and governmental agencies. William is routinely asked to serve as an advisor and consultant during construction to guide his clients through on-site disputes and emergencies with the objective of keeping projects on track, reducing the likelihood of litigation, and closing out the projects smoothly.
Commercial Litigation
- Trial counsel for judgment creditor in multi-million dollar judgment enforcement trial involving claims of fraudulent concealment and alter-ego; 7-day bench trial.
- Retained to substitute as counsel and defend a director of a foreign airline three months prior to trial in an action by minority shareholders for breach of corporate by-laws, fraud, aiding and betting conversion, malicious prosecution, and unjust enrichment with damages alleged in excess of $35 million. After taking the depositions of the Plaintiffs and success in strategic pre-trial motions, the plaintiffs dismissed the case in its entirety on the eve of trial.
- Senior litigator on a team representing a Fortune 500 company in a lawsuit for specific performance to enforce a purchase option for a thirty-million-dollar property adjoining a super-regional mall resulting in Summary Judgment entered in favor of the client, which was affirmed on appeal.
- Successfully prosecuted claims on behalf of a group of victims of an international Ponzi scheme representing a multi-million-dollar investment, securing substantial 70% recovery in a negotiated settlement.
- Represented seller of high-end property against buyers in an action for breach of contract due to failure to close, securing a settlement for more than eighty percent of substantial six-figure security deposit in less than six months.
- Defended manager of development company in claims asserted by minority partners for accounting and breach of fiduciary duties concerning several projects valued at several hundreds of millions of dollars, achieving a dismissal of all claims.
- Defended and prosecuted counterclaims on behalf of manager of development company against a 50% partner for accounting, mismanagement, and corporate malfeasance, resulting in negotiated settlement of seven-figure buy-out in favor of client.
Construction Litigation
- Lead trial counsel for one of Florida’s largest condominium associations in lawsuit for breach of contract, negligence, and trespass against neighboring developer, general contractor, subcontractors; obtained seven-figure verdict on all counts in a 1-week jury trial.
- Trial counsel for general contractor in payment and construction defect dispute with subcontractor on a large luxury condominium on Miami Beach; 2-day bench trial.
- Successfully prosecuted civil theft claims on behalf of foreign construction company against officers and insiders for embezzling company funds through fraudulent invoices scheme resulting in over four-million-dollar judgment.
- Represented a national fair housing developer in several contested claims against a surety after the client’s general contractor, a national company, filed for bankruptcy and abandoned three ongoing development projects valued in excess of one hundred million dollars, securing a substantial recovery of more than 70% of the claim in a negotiated settlement at a pre-suit mediation.
- Represented several homeowners of high-end luxury estates in litigation against general contractors and sureties for construction defects and delays.
- Defended an international architectural firm against claims for design errors and omissions and dereliction of construction administration duties resulting in allegedly millions of dollars’ worth of delays and cost overruns, settling the case at a nuisance value on favorable terms to the client.
Construction Projects
- Represents development joint venture in connection with 65-unit luxury condominium development and marina club house in Naples, negotiating design agreements, preconstruction contracts and guaranteed maximum price construction contract valued at ~$115 million, and serves ad project consulting counsel.
- Represents hotel development company as project consulting counsel concerning complex multi-phase development project on several construction lending and draw scheduling contracts valued at ~$250 million.
- Represents foreign development entity in connection with 48-unit luxury condominium development in Pompano Beach, negotiating guaranteed maximum price construction contracts valued at ~$50 million, and serves as project consulting counsel.
- Represents state-wide community developer in drafting and negotiating contracts with all subcontractors and design professionals, and serves as project consulting counsel on several ongoing projects.
- Represents one of Florida’s largest condominium associations in drafting and negotiating contracts with contractors, engineers, and owner’s representatives, and serves as project consulting counsel for during 50-year re-certification and ~$30 million capital improvements.
- Represented design-builder and turn-key developer in drafting and negotiating contract suite to be used with homeowners, subcontractors, and design professionals in all aspects of client’s business.
- Miami-Dade Bar Young Lawyers Section 40 under 40 Recipient, 2024
- The Best Lawyers in America®, "Ones to Watch", 2024-2026
- Florida Super Lawyers, 'Rising Star', 2024-2025
- Florida Bar, International Law Section
- Florida Bar, Business Law Section
- Florida Bar, Trial Lawyers Section
- Miami-Dade Bar Association
- Editor of the Middle East Review, a publication of the ABA International Law Section (2018-2021)
Twenty-Three Berger Singerman Attorneys Recognized in 2025 Edition of Florida Super Lawyers
June 26, 2025
April 7, 2025
Berger Singerman Announces 2025 Elevations
January 1, 2025
Fifty-Six Berger Singerman Attorneys Recognized in the 2025 Edition of Best Lawyers In America
August 15, 2024
June 9, 2022
Berger Singerman Adds Litigation, Construction, Real Estate and Insurance Law Attorneys
August 30, 2021
A Primer on Florida’s Construction Lien Law
September 22, 2021
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- Cole, Scott & Kissane, P.A.