Building element suitable for forming a wall (3, 4, 5) of a building, comprising, in a position of use: - a bottom surface, - a top surface positioned at a distance (Hb) from the bottom surface, - a first pair of opposite side surfaces, spaced-apart in a length direction, - a second pair of opposite side surfaces, spaced-apart in a width direction, connecting the first pair of side surfaces, wherein the first and second pairs of side surfaces connect the top surface and the bottom surface, - a central through-hole extending substantially vertically from the top surface to the bottom surface, the central through-hole having a circumferential surface being substantially impermeable to fluid concrete to be poured into the central through-hole, - a side through-hole extending substantially vertically from the top surface to the bottom surface, parallel to the central through-hole, having a width (Ws) in width direction smaller than a width (Wc) of the central through-hole, characterized in that the circumference of the side through-hole is positioned at a horizontal distance (d) from the circumference of the central through-hole, such that the side through-hole is substantially fluidly isolated from the central through-hole along a height (He) of the central through-hole, wherein between the top surface and the bottom surface a sideways fluid connection is present between the central through-hole and the side through-hole for allowing fluid concrete poured into the central through-hole to enter the side through-hole, a height (Hfc) of the fluid connection being at most 20%, preferably at most 10% of a height of the central through-hole. - a bottom surface, - a top surface positioned at a distance (Hb) from the bottom surface, - a first pair of opposite side surfaces, spaced-apart in a length direction, - a second pair of opposite side surfaces, spaced-apart in a width direction, connecting the first pair of side surfaces, wherein the first and second pairs of side surfaces connect the top surface and the bottom surface, - a central through-hole extending substantially vertically from the top surface to the bottom surface, the central through-hole having a circumferential surface being substantially impermeable to fluid concrete to be poured into the central through-hole, - a side through-hole extending substantially vertically from the top surface to the bottom surface, parallel to the central through-hole, having a width (Ws) in width direction smaller than a width (Wc) of the central through-hole, characterized in that the circumference of the side through-hole is positioned at a horizontal distance (d) from the circumference of the central through-hole, such that the side through-hole is substantially fluidly isolated from the central through-hole along a height (He) of the central through-hole, wherein between the top surface and the bottom surface a sideways fluid connection is present between the central through-hole and the side through-hole for allowing fluid concrete poured into the central through-hole to enter the side through-hole, a height (Hfc) of the fluid connection being at most 20%, preferably at most 10% of a height of the central through-hole.