A good place to begin searching is in the Library catalogue. Use the Library catalogue to find books and journal articles on your topic.
For detailed instructions on using the Library catalogue, watch this video:
A Library Catalogue search for the keywords: Seagram Building found this book & peer reviewed journal article about the building.
Not all the information you get from a search will be useful. A successful search will show results relevant to your topic. If your results are not relevant go back and try different keywords in your search.
To evaluate whether your source is of sufficient quality use the C.R.A.P Test. Click on the letters of the acronym to learn more:
Using the same searches you've mapped our earlier, try using some of the key resources for architecture, like Proquest, Taylor and Francis Online Journals and JSTOR. You'll find the results are different in each database. The picture below is one of the top hits from JSTOR.
The requirement to find images for a building is common in architecture assignments. Mostly these images are found via Google image searches, though you can also use the image resources listed on the home page of this guide to find some good content, such as this photo of the Seagram Building interior from ArtStor.
Image credit: Stoller, E. (1958). Seagram building, interior, corner office [Photograph]. ArtStor. www.artstor.org
There's also a great talk by Mies van der Rohe in Pidgeon Digital where he talks at length about designing the Seagram Building..