I have joined both the LA Beginning and Old & New Downtown LA tour on the same day,, there was around 20 mins gap in between, with the Grand Central Market nearby that can grab a quick lunch easily.
Phil has been a great tour guide, very friendly and approachable, tried to engage all participants as much as he can. Without a guide I wouldn't find the downtown being so interesting, LA is huge and definitely worth a tour to visit with a better purpose, and to know about the history and some of the historic buildings