The invention relates to a floating offshore structure (1) anchored to the sea
bed (2) . The floating offshore structure (1) comprises a
hull (12) having longitudinal sides (3, 4) and transverse sides (5, G) , bow and
stern anchoring points (13, 14, 40) for
mooring a tanker vessel (7) alongside the offshore structure (1) , a main
deck (25) at a predetermined hight (Hl) above
sea level,
hydrocarbon storage and / or
processing devices (26) being placed on the main
deck (25) , a spacer member (20, 21) attached to the structure (1) and projecting transversely from the sides for contacting a tanker vessel (7) moored alongside the structure (1) . The anchoring points of the structure comprise of quick release members (60) , wherein the bow and / or
stern anchoring points (13, 14, 40) of the structure (1) are situated on a secondary
deck (28, 39, 51) which projects transversely from the
hull (2) of the structure (1) substantially at the heights (H2) of anchoring points (34, 35, 36) of the tanker vessel (7) .