San Juan / Old San Juan — US Citizens, No Vote for President, a 500-Year-Old Fortress City

What Actually Makes San Juan Different

San Juan is unlike every other market on this site in one specific, structural way: it is not part of a US state. Puerto Rico is an unincorporated US territory, and its roughly 3.2 million residents are US citizens by birthright (since a 1917 act of Congress), use the US dollar, and can fly to and from the US mainland without a passport. But that citizenship comes without full political representation -- Puerto Rico has no voting member of the US Senate, and its single delegate to the US House, the Resident Commissioner, can introduce bills, sit on committees, and speak on the floor but cannot cast a final vote. Residents of Puerto Rico cannot vote in a presidential general election while they live on the island, even though they can vote in party presidential primaries. This isn't a technicality that only matters to political-science trivia -- it directly shapes federal disaster response, federal program funding formulas, and the political leverage residents have when something like the island's power grid fails.

Old San Juan, the historic core around which the wider municipality of 342,259 residents (2020 Census) is built, is a genuinely old city by any US standard. Spanish explorer Juan Ponce de León first settled Caparra on the mainland in 1508; the Spanish Crown authorized the move to the current walled islet in 1521, and the settlement took the name San Juan Bautista de Puerto Rico. Construction on Castillo San Felipe del Morro -- El Morro -- began in 1539 and continued in stages until reaching its current form around 1787; the fort covers 27 acres, rises 145 feet above the Atlantic, and has seaward walls 18 feet thick. Castillo San Cristóbal, also 27 acres and built over roughly 150 years to guard the city from a land assault, is described by the National Park Service as the largest Spanish fortification in the New World. Both forts, along with La Fortaleza (the oldest executive mansion in continuous use in the Americas) and the city walls, were designated a UNESCO World Heritage Site in 1983 -- a real, internationally recognized historic designation, not marketing language.

The island's modern power grid is the single fact a mainland buyer is least likely to already understand, and it is central to what owning property here actually means. Hurricane Maria made Category 4 landfall on September 20, 2017, and effectively destroyed the grid; full restoration took 328 days, the longest blackout in US history, and a George Washington University study commissioned by the Puerto Rico government later revised the official death toll from an initial 64 to 2,975. The grid was not simply rebuilt and left alone afterward: Puerto Rico privatized transmission and distribution operations to LUMA Energy in June 2021, and LUMA's performance has been a live, ongoing controversy since, including a June 2024 outage affecting more than 350,000 customers and an April 16, 2025 outage -- during Holy Week, one of the island's most significant cultural weeks -- that knocked out power to all 1.4 million of LUMA's customers. Multiple sources describe power cuts increasing meaningfully in frequency since the LUMA takeover, with disputes between LUMA and the Puerto Rico Electric Power Authority (PREPA) over funding and maintenance responsibility continuing into 2025. A standby generator here is not a luxury upgrade the way it might be on the mainland -- for many owners it functions as basic infrastructure.

San Juan's property tax system is administered by CRIM (Centro de Recaudación de Ingresos Municipales), a structure genuinely different from any mainland county tax office: CRIM assesses real property against a base valuation methodology tied to 1957 property values (with adjustments), and municipalities then apply a millage rate -- generally cited in the roughly 8.03% to 11.83% range -- against that assessed base, not against current market value. A primary-residence exemption of up to $15,000 of assessed value is available for one dwelling per taxpayer. That combination -- an antiquated assessment base plus a percentage-style millage -- routinely produces an actual tax bill that is a small fraction of what a mainland buyer would expect on a comparably priced coastal property, but this page does not state a specific dollar bill for any given home, since the actual figure depends on that property's own CRIM assessment history. San Juan is also ground zero for Puerto Rico's Act 60 tax-incentive program (which consolidated the earlier Acts 20 and 22), offering qualifying new residents meaningful exemptions on Puerto Rico-sourced capital gains, interest, and dividends. That program has driven a real, well-documented wave of mainland buyers into Condado, Santurce, and Old San Juan specifically, and it has produced real, reported community tension: San Juan housing costs rose more than 60% between 2021 and 2023 by one estimate, against a median household income far below the current median home-listing price, and this page treats that tension honestly rather than only celebrating the incentive.

Several things this research could not confirm at a level this page is willing to state as settled fact: a current, address-specific CRIM assessed value or millage rate (these vary by municipality and parcel and change with each assessment cycle); a specific current insurance premium for a San Juan property, as opposed to general percentage-deductible guidance; and precise, current-year Act 60 income and investment thresholds, which have been amended multiple times and are best confirmed with a Puerto Rico tax attorney rather than a general guide. Anyone seriously evaluating a purchase or relocation here should confirm current numbers directly with CRIM, a Puerto Rico-licensed insurance broker, a Puerto Rico real estate attorney/notario, and Puerto Rico's Department of Economic Development and Commerce (DDEC), which administers Act 60, rather than assuming a figure found online is current.