L. Mark Osher is a partner in Gibson, Dunn & Crutcher's New York and Los Angeles offices and is a member of the firm's Real Estate Practice Group. Mark has broad experience representing both borrowers and lenders in all aspects of capital markets and balance sheet financing, including the origination, securitization and participation of senior and subordinate mortgage loans, mezzanine loans, credit facilities, as well as preferred equity investments. In addition, he represents these same clients in distressed situations, including foreclosures, workouts and restructurings.
Mark also routinely represents institutional and non-institutional real estate developers and operators, opportunity funds, private equity funds and hedge funds in acquiring, developing, operating and selling a broad range of commercial real estate asset classes, including vacant land, office and retail buildings, industrial projects, shopping centers, multifamily and hotels and resorts located throughout the United States. In connection with such investments, he is also experienced in negotiating management agreements, leasing agreements and joint-venture agreements for both operators and their capital partners.
Mark was recognized as a leading California Real Estate lawyer by Chambers USA in 2022, 2023, 2024 and 2025.
Highlights of Mark’s recent representations include:
- IQHQ in obtaining construction financing for commercial real estate projects including its approximately $2 billion life science campus in San Diego, California.
- Stockdale Capital Partners in acquiring and financing various assets throughout the United States, including Horton Plaza in San Diego, California.
- Mesa West Capital in originating multiple mortgage and mezzanine loans secured by hotel, office, industrial, multi-family and other assets located throughout the United States.
- Sixth Street Partners in acquiring interests in existing loans, and in borrowings for property acquisitions including the acquisition of a senior note in an approximately $2 billion mortgage loan secured by a portfolio of industrial, office and mixed-use properties.
- Dune Real Estate Partners in acquiring and selling various assets, including an apartment complex in Arizona, an industrial development project in Menefee, California and an office project in Bellevue, Washington.
- MF1 Capital, in its preferred equity investment in an approximately $1 billion portfolio of multifamily assets located in the Western portion of the United States.
- BioMed Realty in buying, selling and financing various commercial real estate assets.
- Fortress in a complex workout and pre-packaged bankruptcy filing with respect to mortgage loan on a luxury resort in Santa Fe, New Mexico.
He earned his law degree in 1997 with honors from Rutgers University School of Law. He received his Bachelor of Arts degree in history, cum laude, in 1994 from Saint Joseph's University.
Mark is admitted to practice in the States of New York and California.
Capabilities
Credentials
Education:
- Rutgers University - 1997 Juris Doctor
- Saint Joseph's University, Philadelphia - 1994 Bachelor of Arts
Admissions:
- California Bar
- New York Bar