Search for the current office vacancy rate in Houston's Energy Corridor and you will find two defensible answers that differ by more than three times. One puts the number in the high single digits. The other puts it near a quarter of the market. Neither is wrong. They are measuring different things, and the gap between them is more useful to a tenant or investor than either number on its own.
That gap is the actual story here. It tells you where the corridor's demand is concentrating, why some buildings are effectively full while others sit half empty, and how office-to-residential conversions change the amount of space counted as office inventory.
Same Corridor, Two Very Different Numbers
The Urban Land Institute and PwC's Emerging Trends in Real Estate 2026 report, released in November 2025, put vacancy along the Katy Freeway corridor at 7.4 percent, against 24.3 percent for Houston as a whole. Seven months later, a Colliers-sourced report covering the second quarter of 2026 put vacancy for the combined Katy Freeway West and Energy Corridor submarket at 23.8 percent, still lower than the metro's overall rate but nowhere near single digits.
| Source | Vacancy figure | What it measures | Time window |
|---|---|---|---|
| PwC / Urban Land Institute, Emerging Trends in Real Estate 2026 | 7.4% | Katy Freeway corridor, weighted toward newer, higher-quality stock | Released November 2025 |
| Colliers, via The Real Deal | 23.8% | Combined Katy Freeway West/Energy Corridor submarket, all building classes | Mid-year 2026 |
Both figures can be true because they are describing different slices of the same corridor. Houston's own citywide numbers explain why. As of the second quarter of 2026, buildings constructed since 2015 across the metro carried a vacancy rate of roughly 10.8 percent, while buildings built before 2015 ran nearly three times higher at 30.7 percent, according to the same PwC report. A submarket-wide average blends those two populations into one number. A narrower cut that leans on newer trophy stock will report something much closer to the 7.4 percent figure. A cut that includes every 1980s-era campus still standing will land closer to 23.8 percent.
For a tenant comparing submarkets off a single headline percentage, that distinction changes the conversation entirely. The question is not "what is Energy Corridor's vacancy rate." It's "vacancy rate in which buildings."
Where the Demand Is Actually Landing
The leasing activity from the past year and a half shows the pattern in practice. Since the start of 2025, engineering and construction firm McDermott International signed a 50,500-square-foot lease at Westgate II, at 10190 Katy Freeway. SM Energy doubled its footprint at Eldridge One, at 777 North Eldridge Parkway, to 41,000 square feet. Black & Veatch signed for 41,000 square feet at Energy Tower II, at 11720 Katy Freeway.
Those three deals, combined with the rest of the submarket's activity, helped push Katy Freeway West and Energy Corridor to fourth place among Houston submarkets for leasing volume in the second quarter of 2026, behind West Loop, The Woodlands, and Westchase, and accounting for 8.7 percent of the city's total office leasing square footage that quarter, according to Colliers data reported by The Real Deal.
That's a meaningful amount of activity for a submarket that outside observers sometimes treat as a legacy energy address rather than an active leasing market. It also tells you something about who is doing the leasing: engineering, construction, and upstream energy firms expanding or renewing in place, rather than new-to-market tenants discovering the corridor for the first time. If your business fits that profile, you are shopping in a market with real, recent comparables. If it doesn't, the calculus around building class and price becomes more important, not less.
The Second Lever: Buildings Leaving the Count Entirely
Leasing only explains part of why the submarket's vacancy picture is improving. The other half is supply leaving the office count altogether.
The clearest example is The Watt, a 311-unit apartment community at 550 Westlake Park Blvd that opened in September 2025 inside a 19-story tower that once housed BP and ConocoPhillips offices. Developer DeBartolo Development spent $93.3 million converting the former corporate tower into residential units, the first project of its kind in the district. Energy Corridor District President Bryan Brown called it a project that "offers a new option for employees who want to live near their work."
A second conversion is already under construction. OHT Partners broke ground on Park Row Apartments, a 360-unit project on 14 acres at 14192 Park Row Boulevard near Terry Hershey Park, with a state filing showing an expected cost of $28.4 million, or roughly $79,000 per unit, and a completion target of early 2028. Define Living has announced plans for a nearby 388-unit wellness-focused community in the same area.
Every one of those square feet subtracted from the office inventory has the same mechanical effect on a vacancy calculation: it shrinks the denominator. A building that converts from vacant office space to leased apartments doesn't get backfilled by a new office tenant, it disappears from the office count entirely, and whatever vacant space remains in the submarket is now divided by a smaller total. That produces a falling vacancy rate that looks identical, on paper, to genuine tenant demand absorbing space, even though the underlying driver is completely different.
For a submarket built heavily around 1980s-vintage single-tenant campuses, that distinction matters. Some of the corridor's improving numbers reflect firms like McDermott, SM Energy, and Black & Veatch actually signing leases. Some of it reflects older buildings quietly exiting the office market by becoming something else.
What This Means If You're Touring Space or Underwriting a Deal
If you're a tenant evaluating Energy Corridor against other West Houston options, ask for vacancy and asking-rent data specific to the building class and vintage you're actually touring, not the submarket blend. A campus built after 2015 is competing in a market closer to the 7.4 to 10.8 percent range PwC describes for newer stock. A pre-2015 building is competing in a market closer to 30.7 percent, which is exactly where negotiating leverage on rent, concessions, and tenant improvement dollars tends to concentrate.
Citywide, that leverage still exists even as headline numbers tighten. Gross asking rents across Houston averaged $31.10 per square foot in the second quarter of 2026, up 8.1 percent from $28.76 a year earlier, according to Houston.org's quarterly office market update. Available space citywide broke down to roughly 38.6 million square feet in Class A buildings, 25.9 million in Class B, and 1.8 million in Class C. Rising average rents and a large Class B pool sitting available at the same time is not a contradiction. It's the same flight-to-quality bifurcation showing up in the pricing data.
If you're on the investment side, the profile worth watching is the one The Watt represents before its conversion: a large, aging, single-tenant-built tower that lost its anchor and had no realistic path back to full office occupancy at its original scale. Two more projects following that same playbook, Park Row Apartments and Define Living's nearby community, suggest this isn't a one-off. It's a repeatable strategy for a specific category of Energy Corridor asset, and identifying which buildings fit that category before a formal listing is where real underwriting work happens.
A Few Questions Worth Asking Before You Sign
Does a falling vacancy rate mean falling rents too? Not in this market. Houston-wide asking rents rose to $31.10 per square foot in the second quarter of 2026, an 8.1 percent increase year over year, even as overall availability eased slightly. Landlords with quality space are using tightening conditions as pricing leverage, not discounting it away.
Is Energy Corridor still an active leasing market or mostly a story about conversions? Both, and that's the point. The submarket ranked fourth in Houston for leasing volume in the second quarter of 2026 at 8.7 percent of citywide activity, while simultaneously losing office square footage to residential conversion. Demand and supply reduction are happening at the same time, in different buildings.
What happened to the old BP and ConocoPhillips tower in the district? It reopened in September 2025 as The Watt, a 311-unit apartment community at 550 Westlake Park Blvd, following a $93.3 million redevelopment by DeBartolo Development.
Reading a single vacancy percentage off a report and applying it to every building in the Energy Corridor will give you the wrong answer more often than not. If you're weighing a lease, a renewal, or an acquisition in this submarket and want the numbers pulled apart by building class and vintage before you commit to anything, that's the kind of groundwork the team at Aspire CRE runs on every engagement. Discover your property's value before the next report changes the headline number again.
