Odakyu Electric Railway Co., Ltd. announced that on March 25, 2024, construction began on Zone A of the Shinjuku West Gate Development Plan (the Plan), a project in which the company, Tokyo Metro Co., Ltd. and Tokyu Land Corporation are the project entities. Zone A is a joint project of the three companies. Building is scheduled to be completed in fiscal year 2029.

The Plan is based on higher-level plans such as the Shinjuku Base Redevelopment Policy and Shinjuku Grand Terminal Design Policy 2019 as well as location characteristics, and "the implementation of fundamental maintenance to realize the Shinjuku Grand Terminal, "the introduction of urban features that help enhance international competitiveness", and "the strengthening of disaster-prevention functions and reduction of environmental burdens" are the three elements that constitute its maintenance policy. It is a project that has been promoted by the Company and Tokyo Metro as a development plan that takes into consideration the characteristics of the area and is primarily intended for commercial and office use. In order to maximize this value, Tokyu Land officially joined the project in February 2024, and this new construction is beginning as a joint project between the three companies, with everyone providing their knowledge of urban planning and development projects, diverse solutions, and software know-how in the collaboration.