Manse near the Iron Gate
The Manse near the Iron Gate is a residence in King's Landing.
The walled manse is located on a sprawling estate in the northeastern corner of King's Landing near the Iron Gate, not far from the sea.  The stone-and-timber house features a longhall with diamond-shaped windowpanes and an upstairs bedchamber with a featherbed. The grounds include a stable, a well, and a garden with fruit trees and a stone bathing pond. The gates have an ornate bronze eye that guards can look out through.
A Clash of Kings
Tyrion Lannister settles his mistress, Shae, in the manse after he arrives in King's Landing to serve as Hand of the King. Tyrion provides her with servants and a white bird from the Summer Isles. Varys supplies a eunuch strangler, a pair of Ibbenese, a Braavosi daggerman with a hare lip and a lazy eye., and other ugly sellswords to protect Shae on Tyrion's behalf.
Tyrion visits Shae by first traveling to Chataya's brothel, where he ostensibly enjoys the services of Alayaya. However, Tyrion actually travels from the brothel through a secret passage beneath the Hill of Rhaenys to a nearby stable, where he then rides a horse to Shae's manse.
When the riot of King's Landing break out, Tyrion sends Shagga to watch over Shae. Symon Silver Tongue sings to Shae at the manse. Varys arranges for Shae to leave the manse and instead serve in the Red Keep as a maidservant of Lollys Stokeworth. Tyrion promises to move her back into a manse after Stannis Baratheon is defeated.
It is peaceful here, he thought, but for how long?—thoughts of Tyrion Lannister