I've got an Excel file which includes known locations with their exact address (street, house number, city, state). This Excel file does not have a geographical column. Also, I have a .shp file inside those boundaries of buildings.

I want to relate every address in the Excel file to a building from the .shp file in order to represent to the .xls file on a map and for further analysis.

Couldn't find a way to do it in QGIS. Any ideas?