If you want the full version and license for commercial use,
you can purchase here :

https://staircaselab.com/product/dellafina-street/

File include : 

1. Dellafina Street.otf
2. Dellafina Street.ttf
3. Dellafina Street.woff
4. Dellafina Street High Italic.otf
5. Dellafina Street High Italic.ttf
6. Dellafina Street High Italic.woff
7. Dellafina Street Italic.otf
8. Dellafina Street Italic.ttf
9. Dellafina Street Italic.woff