That sounds eerily close, so close I want to say it is it...but sadly I remembered this was one of the few that was unfinished and seemed like it would remain.
I skimmed it and as I got to the end...my hope sunk.
I was like woh this sounds like it...but where was the building, the street where Buffy was fighting something, and then running up to a house that was protected by magic?
I vividly remember it stopping at the crux of the story where they are fighting this big bad wind/spirit/ghost/noncorporeal thing and then something happens. Dawn and the others are there with some book and are protected but something happens to Buffy and it stops there...I think. Or maybe it was too much for me to finish or I got preoccupado, lol. But I have this feeling of: it wasn't finished.
But thank you that series is a good one! Definitely rec it. I didn't finish the first part. I know, strange! I don't think it's The Hunt either. Thanks though!