That is the super amazing Kelsey Dylan.
I used to live in Pillar Box Studios. For a little over 5 years now it's been one of the most amazing studios in LA. Not your typical white box, boring studio. Of course, leave it to me to find the nearest white box to shoot in instead of utilizing everything available in my own home:) This was the stairwell right around the corner from our door. I was often overwhelmed with the sheer number of possibilities in the studio so I'd wind up in the stair well where things were simple:)
BTW... Pillar Box is closing next month so if you're in the LA area you might want to shoot there while you can. Prices have been drastically reduced to give everyone a chance before doors are closed for good.
And no, you can't shoot in the stair well. I only got away with it because I lived there:)