Situated near the front gates of the mansion, it is equipped with central heating and indoor plumbing, and multiple people have stayed there over the years.
In 1983, Jimmy Lee Holt arrived in Port Charles, spitefully announcing that he was Edward Quartermaine's illegitimate son. Unable to deny this sordid truth, Edward was forced to accept that he had sired a child with his past mistress. Jimmy Lee teamed up with Alan Quartermaine's mistressSusan Moore when Crane Tolliver revealed he was still legally married to Lila Quartermaine. Crane gave his unsigned divorce papers to Jimmy Lee on his deathbed and Jimmy Lee used them to his advantage by moving onto the Quartermaine property and into the gatehouse.
After Susan was found murdered at her cottage, Alan attempted to move his son Jason Quartermaine into the mansion. However Monica was so outraged she threatened to move into the gatehouse as she didn't want Alan's illegitimate child on the property. Jason then stayed in the gatehouse with Jimmy Lee and they were later joined by Heather Webber who teamed with Jimmy to try and gain custody of baby Jason and, of course, the six-figure trust fund. Their plan was thwarted when Monica finally allowed Jason to live up at the mansion.
After Beatrice LeSeur, overdosed on Lila's heart medication due to Edward's machinations, Jimmy Lee received $20,000,000 for his silence, which allowed him to secure the gatehouse as his home. Subsequently, Jimmy Lee invited Celia Quartermaine and Grant Putnam to reside with him. Celia eventually left Grant to marry Jimmy. However, in December 1986, facing financial ruin from failing waterfront properties, Celia could not endure the ensuing poverty and left Jimmy and Port Charles for good. In a surprising turn of events, Jimmy Lee married Charity Gatlin, and with a generous check from Edward and Monica, the couple purchased a farm in Indiana to start over. They said their goodbyes at the Quartermaine Mansion before leaving.
During a storm in 1992, Tracy goes into labor while trapped with Jenny at the gatehouse. She later gives birth to her son Dillon Quartermaine at General Hospital.
After Paul Hornsby (Dillon's father), Jenny, Tracy, and Dillon left town Ned was left with the gatehouse. In 1994, Lila offered Lois Cerullo and her record company, L&B Records, the gatehouse. Despite Ned's objections, Lois moved in and established the company there.
In 1995, Alan and Monica's son A.J. Quartermaine gets into a fight with his family while drunk and takes off. Jason chases after A.J. and tries to stop him from taking Ned's new car but when A.J. refuses Jason hops in with him and the two end up crashing on the property just outside the gatehouse. Jason was left with permanent brain damage.
In 1996, Tracy returned to Port Charles and colluded with Jasper Jacks to take over ELQ. Their scheme, however, fell through, leading to Tracy's banishment once again. Yet, before leaving, she managed to ruin Ned's marriage to Lois. Upon learning of Tracy's clash with Jenny, a pregnant Lois condemned Tracy as wicked and distrusted the entire Quartermaine family. Resolute in preventing her daughter, Brook Lynn Quartermaine, from following in Tracy's footsteps, Lois ended her marriage with Ned and left the gatehouse after Tracy's departure.
For a brief period, Ned's cousin, Chloe Morgan, resided at the Gatehouse following their marriage, which was intended to rescue her business. Shortly thereafter, Chloe was murdered by Stavros Cassadine.
Edward attempted to secure an heir from Ned and Alexis' unborn child, Kristina Corinthos-Davis, in 2003. However, he suspected that the true father of Alexis's child was Sonny Corinthos. Edward ensured that Ned got full custody of Kristina, but when Ned refused to move into the mansion, Edward had A.J. set fire to the gatehouse where Ned and Alexis were staying, hoping to force them to relocate. Edward's plan backfired when a panicked Ned rushed into the burning gatehouse to find Kristina and got trapped by falling debris. He was rescued by Zander Smith, who bravely entered the burning gatehouse and pulled an unconscious Ned to safety. The gatehouse was said to have burned to the ground.
In 2020, the gatehouse returned after nearly two decades. Following the resolution of the Nelle Benson threat, Michael and Willow Tait peacefully annulled their marriage. Willow then moved into the gatehouse to remain a part of Michael's son Wiley Corinthos' life. Michael and Wiley were set to join her, but Willow paused their plans when her boyfriend Harrison Chase fell ill and was hospitalized with a mysterious condition, leading to only Wiley moving in. During Chase's illness, Willow married him as he was near death, but he miraculously recovered after receiving a last-minute treatment. Meanwhile, Willow began a secret affair with Michael while Chase was confined to a wheelchair.
In August 2021, Chase and Austin Gatlin-Holt check upstairs at the gatehouse and discover Willow has been sleeping with Michael recently. A month later, Michael, Willow, and Chase agree that the marriage is over.
Shortly after, Michael moved into the gatehouse.
In January 2023, Wiley suggests naming his unborn sister either after the family dog, Annabelle the II, or Ahsoka, after the popular Star Wars character. Later, Willow has a nightmare that Nina is stealing her baby, and wants to name her Nelle, after Nina's late daughter.
November 5, Michael comes home to a worried Willow, who claims she still love him and wants to work on their marriage. Even though he knows she's keeping her second kiss with his uncle Drew Quartermaine from him, he forgives her. They make love on the couch.
Michael confronts Willow on November 14, pleading with her to be honest about everything, which she obfuscates and continues to tell him she and Drew just shared one kiss and she loves him - not knowing that he knows everything she's hiding.
At the Christmas party on December 17, Drew and Willow's affair was outed when Tracy accidentally played the nanny cam footage of their one night stand. Nina rushed Willow into taking Wiley and Amelia and coming to stay at her penthouse. Drew himself went to stay at the Metro Court's rival, the Cosmopolitan Hotel.
In January 2025, after getting caught in his father's penthouse explosion, Michael suffers 3rd degree burns over 25% of his body. Arrangements are made to send him to a clinic in Germany, for which he leaves on the 21st.
On January 22, after Michael's transfer to the burn clinic in Germany, Jason negotiates an agreement between Tracy and Willow. Willow gets to stay in the gatehouse with Wiley and Amelia on the Quartermaine property. On February 5, however, after letting Drew sneak onto the property to spend the night with her, Willow decides her situation is too restrictive for her - she and her children move back with her mom.
