Updated September 2026
The short version. Rosemont and Del Ray share a street. If you want a quiet, almost entirely residential grid within walking distance of King Street, that points to Rosemont. If you want a commercial main street inside your own neighborhood, with the errands and the coffee and the Saturday crowd built in, that points to Del Ray. Choose Rosemont if the walk home should be quiet. Choose Del Ray if the walk home should have somewhere to stop.
You have probably already driven both of them. Twice. Maybe on the same Sunday, with the same list of questions, and you came away liking both and deciding nothing.
That is a reasonable place to be, because these two are closer than most searches make them sound. They are not across town from each other. They are across a street from each other. So the useful question is not which neighborhood is better. It is which of a few specific differences you will feel every single day.
Elizabeth has lived in Del Ray since 1993, and we work both sides of the line.
Rosemont and Del Ray at a glance
Category | Rosemont | Del Ray |
|---|---|---|
Historic district name | Rosemont Historic District | Town of Potomac Historic District (Del Ray and St. Elmo) |
Boundary, per the City of Alexandria | "Bounded approximately by Commonwealth Avenue, West Walnut Street, Russell Road, Rucker Place and King Street" | "Roughly bounded by Commonwealth Ave., Route 1, East Bellafonte Ave. and Ashby Ave." |
How it started | Streetcar-era subdivision, developed between 1908 and 1914 (Virginia DHR) | Two subdivisions platted in 1894, incorporated as the Town of Potomac in 1908 (City of Alexandria) |
Was it ever its own town | No | Yes, until the city annexed it in 1930 (City of Alexandria) |
Size on the register record | "some 84 acres" with "more than 450 residences" (Virginia DHR) | Boundaries published by the city; acreage and residence count not stated on the pages used here |
National Register | Listed (Virginia Department of Historic Resources register record 100-0137) | Added in 1992 (City of Alexandria) |
Commercial main street inside the neighborhood | No. King Street sits on the district's edge | Yes. Mount Vernon Avenue runs through it |
Neighborhood-level sale figures in this post | None published here | None published here |
One street apart: what the boundaries actually say
On geography there is nothing to score, because the two districts touch. Commonwealth Avenue is the shared edge, and both of the city's own boundary descriptions name it.
The City of Alexandria describes the Rosemont Historic District as "Bounded approximately by Commonwealth Avenue, West Walnut Street, Russell Road, Rucker Place and King Street." It describes the Town of Potomac Historic District, which is Del Ray and St. Elmo, as "Roughly bounded by Commonwealth Ave., Route 1, East Bellafonte Ave. and Ashby Ave." Both descriptions come from the city's list of Alexandria sites on the National Register of Historic Places.
Read them together and the map gets simple. Rosemont runs west and south of Commonwealth toward King Street. Del Ray runs east and north of Commonwealth toward Route 1 and the Potomac Yard side.
One caution on addresses. Properties near Commonwealth can sit in either district, the boundaries are described as approximate on the city's own page, and a mailing address that reads Alexandria is not always inside the independent city's line. Confirm the district for the exact address on the city's map rather than assuming from the street name.
Where this lands: this is a block-by-block comparison, not a commute comparison.
How each district came together
The two histories are genuinely different, and you can still see the difference in the housing and in the street pattern.
Rosemont was built as a streetcar suburb inside a narrow window. The Virginia Department of Historic Resources register record for the district, record 100-0137, describes it as "a lushly planted residential area occupying some 84 acres" whose "more than 450 residences form a textbook of the era's middle-class architecture," and records that "It was developed between 1908 and 1914 by a group of Washington, Alexandria, and Philadelphia investors." Compact footprint, short build-out, one continuous residential district.
Del Ray started earlier on paper and spent a stretch as its own municipality. Per the City of Alexandria, St. Elmo and Del Ray were "platted in 1894," and "In 1908, Del Ray and St. Elmo formed the incorporated Town of Potomac, with its own mayor, council and police and fire service." Growth tracked the rail yard: "When Potomac Yard opened in 1906, the population of greater Del Ray began to grow significantly." That chapter closed when "The City of Alexandria annexed the Town of Potomac in 1930 and the town ceased to exist." The city also records that "The Town of Potomac was added to the National Register of Historic Places in 1992." Rosemont carries a National Register listing as well.
Chart 1. Recorded dates for the Rosemont Historic District and the Town of Potomac Historic District (Del Ray and St. Elmo), City of Alexandria, Virginia. Year axis runs from the 1890s through the 1990s in twenty-year ticks; a date timeline has no value scale, so no zero baseline applies. Rosemont's band shows the district's original development period only. Sources: Virginia Department of Historic Resources, Rosemont Historic District register record 100-0137; City of Alexandria, History of Del Ray and the Town of Potomac; City of Alexandria, Alexandria Sites on the National Register of Historic Places.
The part that matters when you are choosing: a district platted as a town and grown around a working rail yard ended up with a commercial main street. A district laid out as a streetcar suburb over a handful of years did not. That is history, not a ranking.
Where this lands: if continuity of building era appeals to you, Rosemont's window is the tighter one. If living somewhere that used to be its own town appeals to you, that is Del Ray, and only Del Ray.
Which one has the errands built in
Del Ray, clearly, and it is the biggest day-to-day difference between the two.
Mount Vernon Avenue runs through the middle of Del Ray as a commercial spine, so the errands, the coffee and the dinner are inside the neighborhood you live in. From the sidewalk, that spine is also where Del Ray's street events land, which is a real part of what people are choosing.
Rosemont's character is the mirror image. It is a residential grid that stays residential, with the businesses on King Street at the district's edge rather than woven into the blocks. The city's own boundary description for Rosemont includes King Street, so "edge" here means a few minutes on foot, not a drive.
In our experience, the buyers who fall hardest for Del Ray want to leave the car parked. The ones who fall hardest for Rosemont want the quiet and will walk a little further for a table. The city's district descriptions do not break it out that way; that is what we hear on showings.
Where this lands: Del Ray if you want a main street. Rosemont if you want the quiet and can walk to one.
What you can actually know about price
Less than you would like, at the neighborhood level. We do not have a sourced Rosemont-only or Del Ray-only sale figure to publish here, so we are not publishing one.
What the public record does carry is citywide assessment data from the City of Alexandria's Office of Real Estate Assessments, and it needs its labels read carefully. These are assessed values, not sale prices. They are averages, not medians. "Existing residential" excludes new construction. And they cover the entire independent City of Alexandria, which means they describe neither Rosemont nor Del Ray specifically.
With all of that on the table: as of January 1, 2025, the average assessed value of existing residential property in the city, single-family and condominium together, was $729,925, an increase of 4.45% from the average of $698,794 in CY 2024. The average single-family house was assessed at $1,001,336, up 4.06% from $962,276. The average condominium was assessed at $447,612, up 5.63% from $423,765. Every one of those figures is the city's own, published on its Real Property Assessment Information page.
Chart 2. Average assessed value of existing residential property, single-family houses and condominiums, City of Alexandria (citywide), CY 2024 compared with values as of January 1, 2025. Zero baseline, ticks in increments of two hundred fifty thousand dollars. Figures cover the entire independent City of Alexandria and describe neither the Rosemont nor the Del Ray district. Source: City of Alexandria, Office of Real Estate Assessments, Real Property Assessment Information.
The reason that chart belongs in a neighborhood comparison is the gap inside it. In the same city and the same data set, the average single-family assessment sits more than twice the average condominium assessment. If your Rosemont-or-Del-Ray question is really a house-or-condo question, that gap is the shape of it, and it will move your budget more than the choice of district will.
One note on vintage. Those figures are effective January 1, 2025. The city publishes new assessment information each year, so check the current-year page, or ask us, before you budget off them.
Where this lands: the city's assessment pages for context, and a current comparative market analysis on the specific block for anything you are going to offer on.
What early twentieth-century houses ask of an owner
Close to a tie, and the variation between two houses on the same street is usually wider than the variation between the two districts.
Both are early twentieth-century stock. Virginia DHR puts Rosemont's development window at 1908 to 1914, in a range of styles rather than one repeated builder plan. Del Ray grew outward from the 1894 plats over a longer stretch. Either way, expect the systems, ceiling heights and lot geometry of that era, and expect variety inside it.
Practically, that means an inspection with someone who looks hard at older systems, and a request for permit history on any addition or finished basement. Renovation quality in both districts runs the full range, from untouched to taken back to the studs.
Where this lands: comparable in both. Judge the house, not the district.
What to verify before you write an offer
These are the items we check on both sides of Commonwealth. None of them is a knock on either neighborhood; they are the ordinary diligence of buying a century-old house in this city.
- Historic review. A National Register listing is honorific. It is not the same thing as sitting inside one of Alexandria's Board of Architectural Review districts. Confirm with the city whether any exterior review applies to the specific address before you plan an addition or replace windows.
- Stormwater and flooding. Ask about the Four Mile Run side and about neighborhood stormwater capacity, and get the flood determination for the parcel from the city and from your lender.
- Soils. Marine clay shows up in parts of Northern Virginia and affects foundations and additions. Raise it with your inspector.
- Aircraft noise. The approach to National runs near this part of the city. Stand in the yard at a few different times of day.
- Schools. Attendance boundaries are set by Alexandria City Public Schools and they change. Get the current boundary for the exact address from ACPS directly. We describe boundaries; we do not rate schools.
- Zoning. Lot minimums and what you may add vary by zone, and they are not uniform across either district. Pull the zoning for the parcel from the city before you assume anything about a third bedroom.
Which one fits you
The simplest version of the decision rule, based on what you put first.
A quiet residential street with a walk to King Street: Rosemont. The district is uniformly residential and the city's own boundary for it runs to King Street.
Errands, coffee and dinner inside your own neighborhood: Del Ray. Mount Vernon Avenue is the difference, and no amount of liking Rosemont will produce one there.
A specific house you have already fallen for: whichever district it is in. These two are close enough together that the right house should outrank the map.
Newer construction and less maintenance: probably neither district, since both are historic-district housing stock. Look at the Potomac Yard side and other parts of the city, and let us send options.
Questions we get
Is Rosemont better than Del Ray?
Wrong frame, and we would not answer it that way. They differ on one structural thing: Del Ray has a commercial main street inside the neighborhood and Rosemont does not. Everything else is a matter of which house comes up and what you want your walk home to feel like.
Are they really that close together?
Yes. The City of Alexandria's boundary descriptions for both districts name Commonwealth Avenue, which is the edge they share. You can stand on one sidewalk and look at the other district.
Does the National Register listing mean I need approval to change my house?
Not by itself. National Register listing is honorific and separate from Alexandria's Board of Architectural Review districts, which is where exterior review requirements come from. Whether review applies has to be confirmed with the city for the specific address. Do not budget a renovation on an assumption either way.
Can I use the citywide assessment averages to price a house in either neighborhood?
No. Those averages cover the whole independent City of Alexandria, they measure assessed value rather than sale price, and they exclude new construction. They are useful for orientation and for seeing the single-family versus condominium gap, not for pricing an address.
Which one should I see first?
Whichever one has a house on the market that you would actually live in. If the market is thin in both that week, walk Mount Vernon Avenue on a Saturday morning and Rosemont's blocks on a Sunday evening. Most people know within an hour.
Where each category lands
Category | Where it lands |
|---|---|
Boundaries and location | Shared edge on Commonwealth Avenue. Nothing to score. |
Development history | Different stories. Rosemont 1908 to 1914; Del Ray from the 1894 plats onward. |
Errands inside the neighborhood | Del Ray. |
Uniformly residential streets | Rosemont. |
Older-home upkeep and systems | Comparable in both. |
Neighborhood-level price data in this post | Neither. Citywide assessment averages only. |
Overall | The house first, then the street. Both districts hold up on their own terms. |
Talk it through with us
If you are between these two, the fastest way through it is to walk both with someone who has been on those blocks for a long time. Elizabeth Lucchesi and The LizLuke Team at LONG & FOSTER REAL ESTATE INC have been selling Rosemont and Del Ray for years, and most of our business comes from referrals and repeat clients, which is the only scoreboard we care about. Elizabeth has lived in Del Ray since 1993 and founded The LizLuke Team in 2003.
Tell us what you want your walk home to feel like and we will tell you which side of Commonwealth to start on. It all starts with a conversation, and you can reach us any time through lizluke.com.
Sources
- Virginia Department of Historic Resources, Rosemont Historic District, register record 100-0137. Acreage, residence count and the development period.
- City of Alexandria, Alexandria Sites on the National Register of Historic Places. Boundary descriptions for both districts and the 1894 platting.
- City of Alexandria, History of Del Ray and the Town of Potomac. Potomac Yard, incorporation, annexation and National Register listing.
- City of Alexandria, Office of Real Estate Assessments, Real Property Assessment Information. Citywide average assessed values as of January 1, 2025 and CY 2024.
Disclosure
The LizLuke Team at LONG & FOSTER REAL ESTATE INC. 110 N Royal St, 3rd Floor, Alexandria, VA 22314. Office 703.683.0400. The LizLuke Team (703) 868-5676. Virginia License #0225069250.
Equal Housing Opportunity.
All information is deemed reliable but not guaranteed.
This is general information and is not legal or tax advice.
Historic district boundaries described here are the City of Alexandria's own approximate descriptions and are not a substitute for confirming the district and the zoning for a specific address with the city. Assessment figures are citywide averages of assessed value for the independent City of Alexandria as of January 1, 2025, published by the city's Office of Real Estate Assessments; they are not sale prices and they do not describe the Rosemont or Del Ray districts. This post publishes no neighborhood-level sale figures. School attendance boundaries are set by Alexandria City Public Schools and must be confirmed with ACPS for a specific address.
