through it all marla has facebooked 10 to 12 hours aday, she estimates, sharing pictures and memorials>> thank you so much is what i always say, because i do appreciate all of the different benefits going on. >> reporter: and like others she will keep trying to balance what is lost and what is ahead. >> we just keep on going, you know, there are always be memorials, probably once a year there will be a memorial, and we just keep on going the best we can. >>> farms are popping up on roof tops and warehouses across the country. it is a growing business and delivering fresh food to your grocery store. >> reporter: we have got bok choy growing there. we have green leaf lettuce. >> reporter: lettuce and tomatoes aren't the only things growing at gotham greens. the business itself is expanding. the cofounder claims to have the only two commercial roof top greenhouses in the country, and they are in the process of building more. >> investors were very intrigued by the guy in part of the growing trend of locally produced food. we have raised over $15 million to date. >> reporter: this is about