Advice on connecting flat with different cold and hot water supply; Plumbers Forums

My residential block has 5 floors above the ground floor, the 5th being the top floor (loft under the sloping roof) where one side has the communal cold water tanks for most flats and a communal hot water cylinder for most flats as well. The other side of the 5th floor has a tiny studio, where the the cold water is supplied from a tank above the studio's roof and the hot water is supplied from an adjacent immersion cylinder serving that flat alone. If I get rid of the cold water tank and immersion cylinder for that flat, can I use the building's communal cold water tanks and hot water cylinder? I would use a pump. The kitchen cold water would as is.

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