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The historic moat also imposed some restrictions on its vicinity in terms of construction and the reconstruction of buildings and infrastructures. Because the moat was valuable for its historic beauty, any buildings or structures within the moat had to be approved by the Ministry of Cultural Affairs (MOCA), under the terms of the Cultural Asset Act. In addition, the station area of Yotsuya within the moat was designated as a city park area, in which no building or structure should exceed the established guidelines. Thus, both Yotsuya Station and the Mitsuke Bridge had to satisfy regulations which did not necessarily apply to other development projects.