At the end of your first column you have three closing /div tags. One closes the thumbnail - that's good, one closes the column - also good, one is closing the row - that's bad.
You also have three closing /divs after your second column.
At the end of your third column, after the closing /div for the row, you need to make sure you have /div tags for the neighborhood-guides div and its container.
This might help you get a grip on your divs: