General Intelligence · Floor and Box Puzzles

Seven boxes B1, B2, B3, B4, B5, B6 and B7 are placed one above the other but not necessarily in the same order. Box B4 is second from the top. Two boxes are placed between B1 and B7. Box B4 and Box B7 are not adjacent to each other. Box B3 is placed below Box B7 but not immediately below. Box B6 is placed immediately above Box B5. As many boxes are above Box B7 as below it. Only one box is between Box B7 and Box B5, with Box B5 placed below Box B7. Three boxes are between Box B2 and Box B3. Box B4 is immediately above Box B2. How many boxes are placed below B2?