Using pictures of buildings may be nice to use as part of your presentation materials but you have to be careful with this as the use of building images may be protected by copyright. Even if you made the picture of the building yourself it may still be protected by copyright and therefore not allowed to be used. In some situations it may be allowed to use (for example after payment of fees).
In case of doubt we would recommend not to take the risk and use another picture instead. The book that is part of the Public Speaking Kit comes with a selection of beautiful pictures that you can use for your next presentation.
