Thinking about buying an older office building?

On paper, it seems like a steal. Low price per square foot, good location and maybe even a tenant or two lined up already.

However older office buildings can be great at disguising true expenses. A coat of paint and a fancy new lobby can hide many evils.

Here’s the good news…

Nearly all costly hidden surprises in an old building are discoverable before you close your deal. You simply need to know where to look and whom to bring.

What you’ll uncover:

• Why Older Office Buildings Carry So Much Risk
• The Structural Checks That Come First
• Envelope, Systems and Fire Safety
• Why Old Drawings Matter More Than Old Photos

Why Older Office Buildings Carry So Much Risk

Old office stock isn’t rare. It’s the standard.

The average office building in America is more than 50 years old. According to JLL, 68% of national inventory was built prior to 2000. The majority of office buildings available for purchase or lease were built for a very different workforce, to standards established by a code book that no longer exists, and without modern energy efficiency expectations.

Plenty of buildings were constructed excellently. The issue lies with what occurred subsequent… Years of fit-outs, repaired roofs, redirected ductwork and “temporary” fixes that solidified.

So the question is never “is this building old?”

The question is “what will it cost to make this building work?”

The disconnect between as-built conditions and project requirements is where many transactions fail. Accurately pricing this gap starts with engineering ahead of your offer. Firms such as LB Engineering specialize in shop drawing services that will take your rough scope of work (new steel beams, reframed floor opening, replacement stair) and produce fabrication-ready drawings that a contractor can price. Absent those drawings every renovation estimate you receive will be based on assumptions.

The Structure Comes First

Everything else is cosmetic by comparison.

With time and money, almost any problem can be solved if the structure is good. If not, the deal isn’t worth even one penny.

A structural walkthrough with a licensed engineer should cover:

• Foundations and settlement — stair-step cracks in mortar of brick walls, bowed in one direction concrete walls, cracked or slanted foundations, sloping floors, doors that fail to close square
• Floor load capacity — older offices built to support less weight than today’s tenants require
• Steel and concrete condition — rust, spalling, exposed rebar, failed connections
• Columns and beams — evidence that a prior owner cut/notched a member in fit-out
• Roof structure — sagging, ponding water, rooftop equipment stress frame was never designed to handle

The previous statement trips people up. Each generation of renters puts something on top of the roof. Virtually no one inspects if the frame will support it.

If your plan includes adding levels, opening up the floor plate or heavier equipment being introduced, your structural review needs to answer one question. Can this frame take it? What does the reinforcement cost?

Check The Envelope Before The Finishes

Water is the most expensive thing that can get into a building.

Walk on the roof. Inspect the condition of the membrane, flashing, drains and any repairs. Next walk the perimeter of each floor looking for water stains on ceiling tiles, bubbling drywall and efflorescence on masonry.

Windows should get a separate walkthrough. Missing seals and single pane glass are typical of seventies and eighties constructions and silently destroy energy expenses and tenant comfort.

The exterior facade is just as important. Loose brick, cracked precast panels and corroded anchors are safety hazards, not maintenance concerns. Cities also have fixed cycle facade inspections, which become the new owner’s liability if failed.

The Systems You Can’t See

Three things matter here: age, capacity and paperwork.

HVAC. This is the giant kahuna. Request age of units, service history and type of refrigerant. Equipment operating on ozone depleting refrigerants is one replacement away from the junkyard.

Electrical capacity is more important than ever before. Today’s tenants expect dense workstations, EV chargers and even server rooms. No one built a service panel in the 1970s to handle that kind of load.

Plumbing and elevators complete the list. Cast iron waste lines and aging-out hydraulic elevators are both six figure discussions.

Fire and life safety/code issues. Look at sprinkler protection, alarms, protected exit stairways, accessible entrances and restrooms. Many older buildings are built on grandfathered approvals, and an alteration of use or significant renovation can remove that protection and require complete upgrades.

Ask about hazmat as well. Asbestos in floor tile, pipe insulation and ceiling texture is common in pre-eighties construction, as is lead paint. Neither are deal-breakers. But both hit your budget.

Old Drawings Are Worth More Than Old Photos

Here’s the part most buyers skip…

Ask the seller for all documents in their possession. Original architectural and structural drawings, as-builts, permit files, previous tenant fit-outs, roof warranties and engineering reports.

Then compare those documents to the building standing in front of you.

Plans and reality don’t always match in older buildings. Someone moves a wall and never documents it. A beam gets drilled through for a duct run. Someone drops in a mezzanine with no permit history.

That cost discrepancy can add up quickly. According to research conducted by the Construction Industry Institute, rework equals 2% to 20% of overall project cost. Industry surveys also estimate nearly 14% of rework is attributed to missing or incorrect documentation and inaccurate drawings. During a renovation, that equals money wasted twice.

That’s why shop drawing services are critical on older office retrofits. Shop drawings translate the design intent into detailed, dimensioned fabrication and installation instructions. All connections, all bolts, all clearances. Unclear existing conditions call for that level of detail to prevent a steel package from arriving onsite that doesn’t fit.

Price The Work Before You Commit

Numbers time.

After inspections are completed itemize each and every finding with a price and schedule. Layout first, envelope second, systems third, cosmetics fourth. Negotiate a scoped pricing not a ballpark price. Add contingency for unknowns behind walls and ceilings and include the month’s building will be vacant.

Obsolescence is a threat. U.S. office vacancy reached a historic high of 19.6% in Q1 2025. An older asset with no unique selling proposition is fighting for every tenant. The rehab budget needs to purchase desirable features.

Bringing It All Together

Offices in the older buildings can be great values. There are tons in locations where no one could develop today and for prices that pencil.

But the figure on the listing is only half of the number that matters.

Before committing:

• Have an engineer confirm the structure can carry the plan
• Inspect the roof, facade and windows for water and safety issues
• Check the age and capacity of HVAC, electrical, plumbing and elevators
• Confirm fire safety, accessibility and hazardous material status
• Collect every drawing and verify it against actual conditions
• Convert the findings into priced, scoped work

If you do that, an old building is no longer a risky investment. It becomes a project with a price tag, and that’s something anyone can make a decision about.