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O'Sullivan & Zacchea works strategically to find constructive solutions to disputes between commercial and residential landlords and tenants.

We provide expert counsel for landlord and tenant disputes.

We represent landlords and tenants of residential and commercial properties in leasing transactions and litigation.


We strive to resolve issues between landlords and tenants by creating mutually agreeable solutions.

We understand that for a landlord, their rental property may be their most valuable asset or their sole source of income. Similarly, we appreciate that nothing is as important as having a safe and well-maintained place to live for tenants and their families.  With that in mind, we work to achieve prompt, effective results in difficult and dangerous circumstances. In cases where litigation is unavoidable, we strive to resolve the matter as quickly and efficiently as possible and obtain a reasonable, fair outcome that meets our clients' goals.

    Starting a business is a major event. Whether alone or in partnership, the proper formation is essential to the foundation of the entity. We counsel entrepreneurs, sole proprietors, start-ups, family businesses and small business through the critical process of formation. From understanding the value of incorporation and the various corporate forms to compliance with the rules and regulations of formation, our goal is to provide our clients with the proper platform for success. We regularly advise, draft and analyze operating agreements and partnership agreements, as well as joint ventures and acquisitions.
    Clear communication and mutual understanding is essential to business. Our clients rely on us to negotiate, draft and execute documents that accurately reflect their understanding, comply with regulations and achieve their goals. We counsel clients on reducing liability, mitigating risk and resolving problems before they arise.
    Commercial disputes can be complex and challenging. Businesses require skilled, experienced counsel to advise and advocate for them. We have counseled a wide variety of clients in commercial litigation, including real estate developers, accountants, attorneys and other entrepreneurs in connection with partnership disputes, corporate accountings, liquidations and dissolutions.
    As businesses expand and contract, legal needs often unexpectedly arise. We approach these transitions with our clients' unique financial and strategic plans in mind. We advise and counsel clients in connection with an array of commercial agreements including sales and supply agreements, research and development agreements, licenses, franchise agreements, distribution agreements and indemnifications. We also advise clients on establishing and implementing exit strategies for partners and owners, including transfer of ownership between partners, family members or chosen employees.
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