A "signature scent" experience where they work with a perfumer to create a candle or home fragrance unique to their household.
Commission an architectural watercolor of their first home or a stylized "family crest" that incorporates their hobbies and pets.
A private glass-blowing class, a high-performance driving school day, or a backyard telescope session with a local astronomer.
If you are truly stuck, look at their hobbies , not their home. Do they love pickleball? Get them designer carbon-fiber paddles. Do they love their dog? Get a custom oil painting of the pup in 18th-century royal attire.
A gift card for a high-end cleaning service combined with a voucher for a local private chef.
A behind-the-scenes "after hours" tour of a local museum or a private flight-seeing tour of their city.