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DeltaSync completed the preliminary concept in December 2013. In our vision, the city is composed of modular platforms – either 50 x 50 meter squares, or pentagons with 50 meter sides. Squares and pentagons can be connected and arranged in numerous branch like structures. Squares are estimated to cost approximately $15 million each. This is equivalent $393 per square foot of gross space. But since 20% of each platform is reserved for open/green space, the report projects issuable space to cost $504 per square foot ($5425/square meter). Reinforced concrete was chosen as the construction material of choice for its price and durability. Concrete structures would be molded into sturdy hollow boxes, or “caissons”. Modules would support three story buildings. The design takes into account apartments, terraced housing, office space, and hotels. This concept is based on 11 modules, which could host 225-300 full-time residents when combined, with an additional 50 hotel beds. The total projected cost would therefore be approximately $167 million.
This concept also assesses a scaleable method of financing a breakwater, which could eventually surround the city and allow it to move out to the open ocean. Mobility of the individual modules is key from the perspective of guaranteeing autonomy for the city – in the event that the relationship with a particular host nation no longer suits either party, the platforms could detach from their moorings and float to a different location. Modularity and mobility also enable dynamic geography and empower citizens of the city to rearrange into more desirable configurations as the population grows and evolves.