As the WH inscription itself suggests, the highest concentration of examples of Bauhaus Movement architecture (interestingly, the inscription never uses the term "Bauhaus", instead preferring fuzzier "modern") is around Dizengoff Square, Bialik Square, and along the Rothschild Boulevard. Whichever route you choose between these points, you cannot miss the White City buildings here or there, and will probably see enough of them after half an hour or so.
It is not a contiguous monument by any degree. As you walk around town, you will find quite a lot of regular streets and newer construction that sometimes organically and sometimes not exactly fits in and around this architectural collection. You will also see instances of neglect and dilapidation. However, I did not find that to be the norm. In fact, in the process of geo-tagging photos from my stay in Tel Aviv, I looked up locations on Google StreetView. Practically without fail, Google representations dated around 2015 show the buildings in a significantly worse shape than I found them in November of 2019; in some cases, the improvement was striking. Something must be said about positive regeneration that’s been going on in the city lately.
There is the White City Center on Bialik Square (which is open on a very limited schedule a couple of times a week) and the Bauhaus Center Tel Aviv on Dizengoff Street (which should be open more readily) that offer photo-galleries dedicated to the history of Tel Aviv construction, which may be worthwhile additions to seeing the buildings from the street level. I did not find either of them open when I was around. Hotel Cinema Esther on Dizengoff Square is the likeliest building to venture inside if you feel that your exploration of this WH site would be incomplete without an interior visit.