IDX

Listed by Joel Katz · Courtesy of JOEL A KATZ · Agent MLS ID# MFR743511784 · Deemed reliable but not guaranteed. · Listing updated: Mar 25, 2026 · 10:53 AM

9 CASTAÑA ST

Guaynabo, Guaynabo, PR, 00968

Active

$10,000,000

$1000/sqft

7Beds
10Baths
10,000Sq Ft
1997Built
1Days on Market

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.

Facts & Features

MFRPR9120156
$10,000,000
Active
7
10
8
2
10,000 sqft
1.2000
1997
Residential
Single Family Residence
N/A

Community Information

9 CASTAÑA ST
San Patricio Urbanization
Guaynabo
Guaynabo
PR
00968
No

Amenities

N/A
N/A
No
No
Yes

Interior

High Ceilings, Walk-In Closet(s), PrimaryBedroom Upstairs
None
Mini-Split Unit(s)
Marble
N/A
N/A
Cooktop, Dishwasher, Dryer, Ice Maker, Refrigerator, Washer, Freezer

Exterior

Tennis Court(s), Outdoor Kitchen, Basketball Court
Concrete
Concrete Perimeter
Concrete
N/A
N/A

School Information

N/A
N/A
N/A

Additional Information

March 24, 2026
1
RESI
West
No

Mortgage Calculator

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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

Listing updated: Mar 25, 2026 · 10:53 AM

Listed by: Joel Katz · 787-587-4331—JOEL A KATZ · 787-587-4331

Updated from Real Estate Market Data

Location

Ahmed ElbatrawyAhmed ElbatrawyEmpire Network Realty

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