Sara's Unisex Salon is one of the shops that open only with the Ultimate Edition.
The official text: 'Get signature salon styles for both Jason and Lucia, including facial hair for Jason and makeup and nails for Lucia.' Rockstar has not said which neighborhood it is in.
Previews of the base game say you can trim or shave hair at home, but other hairstyles need a barber or a salon. Going to salons and shopping together is also one of the ways Jason and Lucia can grow closer.