Castle Collector is a marketplace dedicated to the sale of castles, palaces, and historic estates, featuring approximately 2,870 properties across 17+ countries listed by around 1,000 estate agents. Launched in February 2026 after 11 months of development, the platform garners around 60,000 monthly sessions, primarily organic, with frequent property inquiries. Interestingly, property pages outperform blog content in search rankings, with two-thirds of clicks originating from purchase-centric queries. From January to September 2026, the site recorded 130,796 sessions and 102,721 users, with exponential monthly click growth totaling 3.01 million impressions and an average search position of 7.4. A significant user base arrives from the USA, UK, Canada, and Australia. Enquiries are currently forwarded to estate agents at no charge, although a pricing strategy is being explored with options for fixed fees or success-based commissions. Castle Collector has secured an exclusive mandate for a €4.75 million property, demonstrating potential for revenue through commission-based arrangements. Buyers are urged to monetize by charging agents for leads, offering paid advertisements, and securing exclusive sales mandates. The site operates efficiently under minimal cost, with AI-powered listing updates and automated advertising systems, demanding less than an hour daily for manual oversight. The platform seeks a buyer to capitalize on sales opportunities, given the founders' inability to actively engage due to other commitments. Included in the sale are the domain, source code, property databases, 1,000-agent contacts, user data, the Castle Price Index, and relevant digital accounts, with support offered during the transition.