need recommendation for in building use

I need two way radios for employees in a three story building. I have read so much that I am now overwhelmed with all the good outdoor radios but have no clue what will work well inside. Any help would be greatly appreciated

You want UHF radios, with good range. Something like:

http://www.buytwowayradios.com/products/kenwood/kenwood-tk-3230.aspx

Thank you very much. We will order them soon. Thanks again