What do you need it for? Do you want to put it into another scene? Use it for a backdrop for a picture? What type of stairs would be suitable?
Personally I'd say just go on Daz's (or your favourite) website, look through the interiors product page and browse through the promo pictures.
Just as examples, here are a few stair sets.
https://www.daz3d.com/fg-tavern
https://www.daz3d.com/media/catalog/product/cache/1/image/9df78eab33525d08d6e5fb8d27136e95/0/2/02-fg-tavern-daz3d.jpg
or
https://www.daz3d.com/collective3d-long-island-mansion
https://www.daz3d.com/media/catalog/product/cache/1/image/9df78eab33525d08d6e5fb8d27136e95/1/0/10-collective3d-long-island-mansion-daz3d.jpg