First attempt. Too much detail.
Reduced detail by enlarging factory shape and removing door.
Aligned vertical edges of the roof to the pixel grid.
Made windows a bit shorter and adjusted position of the bottom row.
Moved windows and tested adding door back.
Adding the door back was a bad idea.
Tried moving door to get rid of a blur caused by a fractional pixel.
This animation shows the progression of the SVG files used for the pinned tab.