The logo should be modern, professional, and simple. A little bit of playfulness is nice, but we don't want it to be too cute -- it is aimed at business users. Also, we will want to use the logo to create a favicon for the site as well, so hopefully some element (such as the first letter) can be turned into a small square icon.
Although it is fine to incorporate color into the logo, it will also need to work in grayscale and monochrome, for use in different media. It should not include photorealistic elements.
Our existing placeholder logo is purely text-based. I'm attaching it here so that you can see what it looks like, but we don't need to adhere too closely to this. I'm also attaching an email that incorporate the logo, although these emails will soon be redesigned.
Some possible design directions are to incorporate a common tool, such as a hammer or wrench (attached) into one or more of the letter forms. It's important that we not be too specific or too aggressively masculine -- building staff perform lots of different types of work. Again, the main feeling should be friendly professionalism.
Finally, I'm attaching a screenshot of the app itself. The new logo will go in the upper left, where it presently says "Gridium". As you can see, the logo will also need to work in monochrome white in this setting.