




9 CASTAÑA ST
Guaynabo, Guaynabo, PR, 00968
Active$10,000,000
$1000/sqft
About this home
Nestled on 1.2 acres, 9 Castaña St. represents a rare opportunity to own a multigenerational estate within San Juan’s premier gated community, San Patricio. Designed by award-winning architect Carlos Betancourt, the residence masterfully balances grand-scale entertaining with a layout that remains intimate and connected, ensuring comfort for every member of the family. The resort-style outdoor spaces create a private sanctuary in the heart of the city, featuring a fully equipped outdoor kitchen, spa-inspired pool and jacuzzi, basketball court, outdoor air-conditioning system, tranquil koi pond, and a chicken coop. Inside, the home showcases soaring ceilings and expansive living areas, including multiple formal and informal gathering spaces, a game and media room with direct access to the outdoor entertaining areas, and a fully equipped private gym. Offering over 10,000 square feet of refined living space, the residence includes 7 bedrooms, 8 full bathrooms, and 2 powder rooms. On the main level, doors open throughout, creating a seamless indoor-outdoor flow, connecting the interior living spaces to the beautifully designed outdoor areas. Additional features include a double backup generator with automatic transfer switches and a 6,000-gallon cistern with a water treatment system, ensuring comfort and reliability year-round. The property has a covered carport for 4 vehicles, along with additional driveway parking. Centrally located, this home is approximately 10 minutes from the Condado area and 25 minutes from Dorado.
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This calculator provides estimates for informational purposes only and is not a loan offer, pre-approval, or commitment to lend. Actual rates, payments, and loan terms vary by lender and are subject to credit approval, income/asset verification, and market conditions. Property tax and homeowners insurance shown are estimates and may differ. PMI applies when the down payment is under 20%. For an official Loan Estimate, contact a licensed mortgage lender. JOEL A KATZ is a licensed real estate brokerage, not a mortgage lender. Equal Housing Opportunity.
1 day on market
Listed by: Joel Katz · 787-587-4331—JOEL A KATZ · 787-587-4331
Updated from Real Estate Market Data
MLS/IDX data last updated: October 24, 2026 2:03 PM . All data is obtained from various sources and may not have been verified by the broker or MLS GRID. Supplied Open House Information is subject to change without notice. All information should be independently reviewed and verified for accuracy. Properties may or may not be listed by the office/agent presenting the information
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