Daniel M. Costello

Daniel M. Costello is a skilled attorney who spans transactional law and civil litigation. He advises individuals and businesses, strongly emphasizing community association law, including cooperatives, condominiums, and homeowners associations. His counsel helps board members navigate complex legal frameworks to meet operational and governance goals.

Daniel earned his Juris Doctor from George Washington University Law School and holds a Bachelor of Arts degree in Philosophy, Classics, and Religion from the University of Mary Washington, graduating cum laude. He is admitted to practice law in Maryland, the District of Columbia, and Virginia and is licensed to appear before multiple federal and state courts in these jurisdictions.

Daniel’s legal services include drafting and amending governing documents, developing rules and regulations, managing assessment collections, and advising on infrastructure planning. He also represents clients in contract disputes, construction defects, tort actions, and estate matters. Notably, he recently secured a favorable outcome for a hotel client in a breach of contract dispute over remodeling defects.

Before founding his firm, Daniel worked with a prominent regional law firm known for its excellence in community association and litigation matters. His experience has made him a trusted advisor to association boards, offering strategic guidance and litigation support when needed.

Daniel M. Costello is active in several professional organizations, including the District of Columbia Bar, Maryland State Bar, and Virginia Bar Associations, as well as the National and Potomac Associations of Housing Cooperatives. He continues to advocate for best practices in housing law and community governance through these affiliations while staying current on evolving legal standards.

Law Office Affiliations

• Principal, Costello, P.C.
• Member, Montgomery County Bar Association
• Member, Maryland State Bar Association
• Member, District of Columbia Bar Association
• Member, American Bar Association
• Member, National Association of Housing Cooperatives
• Member, Potomac Association of Housing Cooperatives
• Member, District of Columbia Superior Court and Court of Appeals
• Member, United States District Court for the District of Columbia
• Member, United States District Court for the District of Maryland
• Member, Maryland Court of Appeals
• Member, Maryland District and Circuit Courts
• Member, Supreme Court of Virginia
• Member, Virginia District and Circuit Courts

Licensed State

• District of Columbia
• Maryland
• Virginia

Education

• George Washington University Law School
  Juris Doctor (JD)
• University of Mary Washington
  BA in Philosophy, Classics, and Religion

Awards & Badges