Lowtown is home to a squalid elven alienage. Here, like in most Thedas alienages, elves are packed into tiny rundown apartments and effectively segregated from the human population. Kirkwall's alienage is even more dilapidated than the rest of Lowtown, but the elves go to great lengths keeping the place looking bright and festive. The vhenadahl, or "Tree of the People", standing in the middle of the alienage is a symbol for elven pride and shared cultural identity, and it is lovingly cared for.
It's difficult to say if the elves would continue confining themselves to the alienage if they were given the chance to mingle. They may not admit it, but some feel that living among their kind is far better than living with humans, no matter how terrible alienage life may be.
Most alienages are almost ghost towns now, with fewer than usual residents. Keep this in mind during roleplay, as places like markets and taverns won't be busy. If you're playing an elf, you'll need to explain why your character didn't follow after Solas, along with most other elves, in your backstory.
This is from the Trespasser epilogue:
"Many elves left the Inquisition under mysterious circumstances, as did elven servants across Thedas. None could say where they went but those who believed the Inquisitor's story about Fen'Harel wondered just how large the Dread Wolf's forces were... and what the ancient elven rebel had planned. An inquest into the matter bore little enlightenment."