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Montgomery Park has a green rooftop. I'm pretty sure it's accessible, but given the fencing and the gates and whatever, I'm not so sure about the building itself. I presume there's a visitor's entrance somewhere.

the new hilton convention hotel has one ~ i was on a tour of it about two months ago. it is on the lower section in the middle - you could probably see it from the bromo seltzer tower.

i assume you're talking roofing for a low-slope (i.e.flat) roof?

don't forget that there may be additional costs associated, i.e. additional structure to support the added load of the growth medium. so it's almost a case-by-case basis for existing buildings.

there are also issues such as life-cycle cost, etc. etc. if you google "green roof square foot cost" there are many resources that quote a wide range of SF costs. but again i believe that this is largely for new construction.

Green roofs: If we could only get more people to use them! As an architect, I am getting more and more questions about green roofs, along with a lot of other environmentally friendly building strategies. The big stumbling block is usually the initial cost. It can be a challenge to get people to see beyond the dollars now versus the savings later, which is also the case with most building designs.

The owner has to be willing to get involved with maintenance, because green roofs aren't exactly install and forget. As was pointed out in previous comments above, they are more expensive than most roofs and they usually require special attention to structural support, drainage and access. The key is appropriate design combined with good installation. The designer and the installer have the most influence on a successful green roof, at least to the point wher the owner will have little to no trouble assuming responsibility for it.

They can be attractive, they have readily observable positive effects on the internal and external environments of buildings, and there is just something really cool about having flowers and grass growing on your roof. For companies that have significant infrastructure, the heating and cooling benefits alone can make it worthwhile. As an example, the BP minimarket/gas station at the bend in Key Highway (next to the General Ship Repair Co., across from the Royal Farms outlet) has a green roof. The parent company reportedly has made that a component of their prototype building programs.

I haven't yet seen the roof on the new Hilton, I'll have to check that out.

I'm surprised there was no mention of the Power Plant's green roofs. They really are a sight to be seen. Here's my shot of them in action with my cell phone.

http://visitmybaltimore.com/video/452/