. >> reporter: noel chasse supports it.nerable to breaking or falling especially during a winter storm. >> we have concerns on high windy days. i try to say stay away from the forest because we don't know whether or not there's a safety issue with the trees. >> reporter: the three acre monterey pine stand is directly behind the presidio landmark apartments where residents are acutely aware of the tenuous timber. >> the tree made this huge sound. nobody knew what it was. people came looking and calling the office. we were frightening. >> reporter: last month one of the pines crashed into a metal gate. >> i'm not for taking trees down, but if it's a safety is e issue, go right ahead. >> reporter: the trees will come down next week. it will take place on weekdays for the next month or so. after the trees have been removed, the presidio trust says they'll be replaced with native plants. the tree removal is part of on going maintenance. several other pine groves were removed this summer. reforestation from years past is taking s