DC Is Finishing a Nearly 40-Year Transformation — With a $260 Million Luxury Tower Overlooking the Tidal Basin
Imagine waking up, opening the curtains and seeing the Tidal Basin, Potomac River and some of Washington, DC’s most famous monuments outside your window. That is the setting for Portals IV, also known as 1301 Maryland Avenue, a new $260 million luxury residential development rising in Southwest Washington, DC.
And there is fresh news: on August 27, 2026, Portals IV officially topped out, meaning the building reached the completion of its main vertical structure. The milestone comes just over a year after its June 2025 groundbreaking, with completion anticipated in 2027. (skaengineers.com)
A $260 Million Address at the Gateway to Monumental Washington
Portals IV is being built at 1301 Maryland Avenue SW, just south of the National Mall and overlooking the Tidal Basin. The approximately 525,000-square-foot development will contain 356 market-rate luxury residences and is designed by WDG Architecture, with interiors by Akseizer Design Group and construction by Balfour Beatty. (skaengineers.com)
Its location is what separates this project from the wave of other luxury apartments being constructed around Washington. WDG says the building was specifically designed with expansive glazing and residential layouts intended to maximize views toward the Potomac River, National Mall and Washington's monuments. (wdgarch.com)
Imagine Waking Up to These Views
The views could become Portals IV's biggest selling point. The property sits beside the Tidal Basin and close to Washington's monumental core, creating the potential for certain residences and amenity areas to have extraordinary sightlines across the water and toward DC's landmarks.
Imagine spring mornings overlooking cherry blossoms surrounding the Tidal Basin, evenings watching the sun fall across the Potomac and nighttime views of Washington's illuminated monuments.
WDG describes the residences as being designed to feel connected to this surrounding landscape, with large expanses of glass bringing natural light and city views into the homes. (wdgarch.com)
The Rooftop Could Be the Showstopper
The residences aren't the only places designed to capitalize on the location.
Portals IV will feature an expansive rooftop retreat with an outdoor swimming pool and sky terrace, along with grills and firepits for residents. Plans also include a piano lounge, clubroom, coworking spaces, fitness facilities, dog spa and park, and a game lounge featuring a sports simulator. (1301maryland.com)
Washington DC's latest development report also lists plans for a roughly 2,500-square-foot public rooftop restaurant within the penthouse level, potentially giving visitors—not just residents—another elevated destination near the Tidal Basin. The report targets delivery for the third quarter of 2027. (wdcep.com)
But This Story Actually Started in the 1980s
Here's what makes Portals IV much more interesting than another new apartment building: Washington has been working toward completing this development for almost four decades.
The District of Columbia Redevelopment Land Agency identified the vacant Portals property for development in the 1980s. In 1987, Republic Properties and Eastcoast Development were selected to master-plan and develop approximately three million square feet on the site. (republicfamilyofcompanies.com)
Nearly 40 years later, Portals IV represents the concluding phase of that original vision.
The broader Portals complex has evolved into a major mixed-use destination containing three Class-A office buildings, the luxury Salamander Hotel and the neighboring 1331 Maryland Avenue residences. Once 1301 Maryland Avenue and its plaza are finished, the overall Portals complex will total approximately three million square feet. (skaengineers.com)
From a Vacant Site to a $2 Billion+ Development
The scale of the transformation becomes even clearer when looking at the entire Portals property.
Balfour Beatty says the completed complex will have an aggregate market value exceeding $2 billion. What started as a large redevelopment opportunity decades ago has gradually become a prominent cluster of residences, offices and hospitality overlooking one of Washington's most recognizable landscapes. (balfourbeattyus.com)
Portals IV effectively puts the final major piece into that puzzle.
That makes the August topping-out milestone particularly significant: after nearly four decades of planning and development, the Portals vision is approaching completion.
356 New Luxury Residences Are Coming
Portals IV will add 356 market-rate residences to Southwest DC. While final apartment pricing and rents have not yet been publicly released, the project's positioning makes clear that this is intended to compete at the upper end of Washington's rental market.
The project's official site calls 1301 Maryland Avenue the “next chapter in luxury living” and emphasizes premium finishes, services and views. Preleasing is expected to begin in 2027. (1301maryland.com)
For prospective residents, the appeal is likely to extend beyond the apartment itself. This is a location close to the National Mall, Smithsonian museums, waterfront destinations and Metro while still offering the kind of extensive amenity package typically associated with newer luxury developments.
The Tidal Basin Becomes Part of the Lifestyle
Location is often used loosely in real estate marketing, but here the relationship with the monumental core is unusually direct.
The Portals property overlooks the northern end of the Washington Channel and Tidal Basin and sits only a short distance from the National Mall. Federal planning documents have long recognized the elevated Portals site for its vistas toward the Potomac and monumental Washington. (ncpc.gov)
That creates a lifestyle proposition that's difficult to duplicate elsewhere in the region: residents could potentially walk toward the Tidal Basin, National Mall and Smithsonian museums while living in a newly constructed luxury building.
And every spring, one of America's most recognizable landscapes—the Tidal Basin surrounded by cherry blossoms—is essentially outside the neighborhood.
Southwest DC Is Changing Around It Too
Portals IV isn't happening in isolation. Southwest Washington has been undergoing a broader residential and mixed-use transformation, including redevelopment along The Wharf, Buzzard Point and other portions of the Southwest waterfront.
Even within the immediate Maryland Avenue area, more housing is coming. Nearby 1250 Maryland Avenue SW is undergoing an office-to-residential conversion expected to create another 428 multifamily residences. (multihousingnews.com)
Together, projects like these illustrate a larger shift occurring in Washington real estate: portions of the city historically dominated by office space are increasingly becoming places where people actually live.
Portals IV is particularly symbolic because its final phase changed over time as market conditions evolved, ultimately becoming residential rather than simply adding more traditional office space.
Construction Started in 2025 — And It Just Reached the Top
Portals IV officially broke ground in June 2025. Republic Properties contributed $65 million in sponsor equity and secured $195 million in construction financing, including $137 million from Kennedy Wilson and $58 million from Pearlmark. (republicfamilyofcompanies.com)
Then came the major milestone.
On August 27, 2026, the project team celebrated the tower's topping out. That means the building's vertical structure has reached its full planned height and construction can increasingly shift toward enclosure, interiors, amenities, landscaping and completion work. (skaengineers.com)
The current schedule anticipates completion in 2027, with DC's development report specifically targeting Q3 2027 delivery. (wdcep.com)
The timeline looks like this:
1980s: District identifies the Portals site for redevelopment.
1987: Republic Properties and its partner are selected to master-plan the approximately three-million-square-foot development. (republicfamilyofcompanies.com)
June 2025: Portals IV officially breaks ground.
August 27, 2026: Portals IV tops out. 🏗️
2027: Preleasing is expected to begin.
Q3 2027: Current targeted delivery. (1301maryland.com)
Nearly 40 years from the original development award to the final tower approaching completion.
What Could This Mean for DC Real Estate?
Portals IV adds something particularly scarce to Washington's housing inventory: brand-new luxury residences immediately adjacent to internationally recognizable landmarks and waterfront scenery.
That doesn't automatically mean surrounding property values or rents will increase because of one development. But additional high-end residential inventory, new amenities and continued investment can reinforce Southwest DC's transition from a predominantly government-and-office-oriented district into a more complete residential neighborhood.
The project also provides another example of developers betting heavily on residential demand even as Washington's office market continues adjusting to post-pandemic work patterns.
For buyers, renters and investors watching the DMV, that broader transition may be more important than any single tower.
Would You Pay a Premium for This View?
There are luxury apartment buildings throughout Washington.
There are rooftop pools throughout Washington.
But there aren't many places where you can potentially step onto a rooftop terrace and look across the Tidal Basin, Potomac River, National Mall and some of America's most famous monuments.
That's what makes Portals IV worth watching.
The $260 million tower has now reached its full structural height, its 356 residences are taking shape, and completion is targeted for 2027. More importantly, it represents the final major chapter in a Washington development story that began nearly four decades ago. (skaengineers.com)
The question now isn't whether Portals IV will change the Southwest DC skyline—the building is already there.
The question is:
How much would you pay to wake up to one of the best views in Washington?
For additional project details and official renderings, explore 1301 Maryland Avenue's official project site and WDG Architecture's Portals IV project page.
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Major developments like Portals IV can reshape neighborhoods and create new opportunities long before construction is complete.
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Development plans, amenities, timelines and leasing information are subject to change. Development renderings are conceptual and may differ from final construction.
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