The entrance from the Şehzade Başı Caddesi. Note: at the entrance of the area proper (so not to the mosque, but the moment you leave the street) there is a lovely türbe to the left, with first quality Iznik tiles. I requested to be shown inside, but was denied that pleasure. If you ever find it opened: go in.
Similarly, the excellent Strolling through Istanbul guide (Redhouse) makes it clear that the other türbes (of which I can only show a glimpse later, peering from the garden) contain a "veritable historical museum of the two best periods of Turkish tiles, the first extending from the Conquest up until about 1555, and the second and greatest from 1555 up till 1620". To make matters worse the guide later adds that in the princes’ monument the “upper row of windows contains some of the most perfect of Turkish stained-glass in rich and brilliant colors”.