Katier, when using an LF to photograph buildings, several things are important :-
Use a wide angle lens (a wide angle lens on a 5x4 camera is one with a focal length less than 120mm)
Pick your view point carefully before putting up the camera
Use a very sturdy tripod
Choose a calm day (as someone has previously noted, LFs are effected by the wind & can topple over)
It is essential you keep the back of the camera perfectly upright - there are usually 2 spirit levels on the back of the camera, one for Left/right tilt and the other fore/aft - they both have to be absolutely spot on after all the other adjustments are made.
Take your time - they are very slow things to work with
Have a good sense of humour