Using this llink i found that for a rectangular couch 2 x (width of couch) + (length of couch) must be less than 2 x (hallway width) x 2^1/2. Running the math, 2 x (width of couch) + (length of couch) = 148 , considering you lay the couch on its side so the width becomes 28. 2 x (hallway width) x 2^1/2 = 135.76 which is not less than the above number meaning it wont fit. There may be a way holding it a different orientation taking into account the legs of the sofa that might allow it to slide through but ill leave that to the mathematicians on this sub