Generally prayer walks can be used when you are praying for the organisation, for the work that goes on there, and for its employees. It is an immensely powerful experience to walk the ground of the area you are praying for, while you are praying! There are many stories of how God has answered the prayers of those who have 'walked ground'.
Find significant areas of your organisation's site, or buildings, for example corridors with offices or open plan offices, and walk through them slowly, as individuals or small groups (a maximum of say 3 or 4), praying silently as you go. Pray a blessing on all who are working there. As God brings to your attention things to pray for, then bring them before him. Listen for God to speak as you walk.
Remember to respect access limitations, and activities going on in the areas through which you are walking.