Cathy Bolshaw, of STRiFE, said keeping the "vital piece" of Park Street land in public ownership was important because it was "crucial" to the development.

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The party wants an economic plan for Wales based on the extension of cooperative, municipal and public ownership of industries and development land.

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It would have a huge impact on crucial aspects of the economy, from the system of land ownership in the countryside to the financing of public services.

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It has been in public ownership for many years, having been bought by the Land Authority for Wales and the Welsh Development Agency before coming under the control of the Welsh government.

BBC: Wales