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Palace of De Boure is a palace built by order of Leo De Boure, one of the oil millionaires of Baku in the XIX century and the business manager for Baron Rothschild's company. The palace is located on Niyazi street (formerly Sadovaya) facing Azerbaijan State Philharmonic Hall. It was built on the project of architect Nicholas von der Nonne in 1891–1895.
On February 26, 1888, Leo De Boure (1840–1889), the oil magnate, founder of "Caspian Partnership" Joint Stock Company and millionaire appealed to the Baku City Council for approval of two-storied stone palace plan, which he wanted to build. On April 18, 1888, an agreement on allocation of 700 square meters of land was obtained on Sadovaya Street (present Niyazi Street). On August 26, urban engineer Nicholas von der Nonne and city architect, construction engineer Anton Kandinov confirm the plan of the palace. But architect A. Kandinov does not have the signature in the architectural project of the palace, and Nicholas von der Nonne is considered the only architect of the palace. On August 31, 1888 project of construction of the palace was approved by the Mayor of Baku, Stanislav Despot-Zenovich and member of the executive board, L. Nikulin. Soon the construction work began.