There are no perks associated with these upgrades beyond cosmetic changes.
Manor 64,000R (follow the path, bear left at the fork, atop the hill) - Note: This structure requires 3 separate upgrades ( Facade 6,000R, followed by Tower & Gardens 18,000R and then finally the Guest House 40,000R).Brothel 15,000R (past the General Store, on the left) - Unlocks the ability hire Dancers for free.Campfire 7,000R (on the beach, left of the pier) - Unlocks the ability to hire Drunk Pirates for free.Tavern 3,500R (off the main pier, to the right) - Unlocks Tavern purchases (and a Cadaver location for an additional 200R.General Store 700R (at the foot of the pier, to the right) - Unlocks General Store purchases.Harbormaster 500R (located off the main pier, to the left) - Unlocks Harbormaster purchases.They are as follows (Name, Cost, Location and Ability/Perk unlocked if applicable):
There are 6 separate structures on the island that require upgrades. It takes 90,700R to 'fully upgrade your hideout' (it is not necessary to upgrade everything at once). After completing Memory 1 of Sequence 4, you'll gain access to your Hideout - located at Great Inagua (845,468) in the Gibara zone, on the east side of the map - along with the ability to upgrade it.