Placing a wet lab or commercial kitchen tenant inside an existing building is one of the most technically demanding assignments in tenant-rep advisory work. The vertical infrastructure — risers, shafts and penetrations — determines whether a conversion is feasible at all, and misjudging capacity at letter-of-intent stage can unwind a deal months into lease negotiation.
Why Vertical Infrastructure Defines Feasibility
Most commercial tenants care about floor plate, light and column spacing. A lab or kitchen tenant cares about all of those things and then adds a second checklist that is entirely about what runs through the walls and floors. Plumbing stacks, exhaust shafts, electrical risers, gas lines, drain systems and structural penetrations are not cosmetic details — they are the skeleton of the tenancy.
The gap between a building that can theoretically support a lab use and one that practically can support it often comes down to shaft geometry. A landlord may advertise "lab-ready" infrastructure, but the actual capacity of existing risers and the feasibility of cutting new penetrations through post-tensioned slabs or rated assemblies tells the real story.
Understanding that vertical infrastructure analysis is a prerequisite — not a follow-up diligence item — changes how an adviser sequences the evaluation. The riser and shaft review should happen before the client spends money on space planning or MEP concept drawings, because those drawings will be meaningless if the building cannot support the load.
What Risers, Shafts and Penetrations Actually Are
A riser is a vertical pipe or conduit that carries a utility from floor to floor: domestic cold and hot water, sanitary drain, acid waste, process water, natural gas, compressed air, medical gases, electrical feeders, or data conduit. In a standard office building, risers are sized for office occupancy loads and routed through mechanical, electrical and plumbing (MEP) chases that are designed to serve those loads only.
A shaft is the architectural and structural enclosure that houses one or more risers. Shafts in commercial buildings are typically rated fire assemblies, meaning any new penetration through the shaft wall must be fire-stopped in accordance with applicable codes. The shaft also has a fixed footprint that determines how many new risers can be added or how much existing riser capacity can be expanded.
A penetration is any opening cut through a floor plate, wall assembly or shaft enclosure to route a new pipe, duct or conduit. In concrete buildings, penetrations must avoid reinforcing steel and post-tensioning cables; in steel-framed buildings they must clear structural members and fire-rated assemblies. Each penetration carries a cost and a permitting requirement, and in many jurisdictions the fire-stopping specification must be submitted to the building department before work begins.
Understanding the distinction between these three elements is the starting point for a systematic evaluation. An adviser who conflates "the building has a mechanical shaft" with "the building can support a lab exhaust riser" will miss the difference between available shaft volume and usable shaft volume.
Reading the Building's Infrastructure Before You Tour
Before setting foot in the building, an experienced adviser requests the MEP as-built drawings and the structural drawings. These documents reveal the riser locations, the shaft dimensions, the slab thicknesses, whether the structure is post-tensioned, and what utilities currently terminate on the floors under consideration.
Utility termination points matter because a lab or kitchen tenant will often need floor-level connections for process drains, acid waste systems or gas service. If the building has no gas riser above the ground floor, extending gas service to an upper floor requires routing a new riser from the meter, coordinating with the utility provider for capacity, and penetrating multiple floors — a scope that can add months and significant cost to a project.
The structural drawing review should focus specifically on slab type, reinforcing layout and any existing core-drill logs if the building has been previously modified. Many older commercial buildings have informal records of prior penetrations; a thorough records request to the landlord or property manager will often surface these. Knowing where prior penetrations exist and how they were fire-stopped helps the MEP engineer plan new penetrations more efficiently.
If as-built drawings are unavailable — a common situation with buildings constructed before the mid-1980s or with multiple ownership changes — the adviser should request that the landlord commission a field survey as a condition of advancing to a letter of intent. Requesting drawings is inexpensive; discovering mid-construction that a riser conflicts with post-tensioning cables is not.
The Exhaust Shaft: The Most Constrained Resource in Lab Buildings
No element of vertical infrastructure creates more feasibility risk for lab tenants than the exhaust shaft. Laboratory exhaust must be delivered to a dedicated exhaust system that discharges above the roofline at a velocity and height that satisfies local air quality regulations and prevents re-entrainment. In most commercial buildings, this means a dedicated shaft from the lab floor to the roof — one that does not share airflow with HVAC return, general exhaust or kitchen exhaust.
The evaluation starts with measuring available shaft area on the tenant's floor and tracing that shaft continuously to the roof. Any discontinuity — a transfer floor, a mechanical interstitial, a shaft that terminates at a lower mechanical room — requires detailed investigation. Some buildings route lab exhaust through a plenum-based transfer, but this configuration raises compliance questions that the mechanical engineer must address with the authority having jurisdiction.
Kitchen exhaust carries its own constraints. A commercial kitchen exhaust system must handle grease-laden vapor, which requires Type I hood systems, grease duct construction, and clearances from combustible materials that a standard HVAC duct does not require. The grease duct typically cannot share a shaft with any other exhaust, and the shaft interior must be accessible for cleaning — meaning cleanout access panels at each floor level must be planned and coordinated with the architectural layout.
The roof termination point is a separate review item. On multi-tenant buildings, lab or kitchen exhaust terminations must be located away from fresh-air intakes serving other tenants, and the distance requirements vary by jurisdiction and by the nature of the exhaust stream. An adviser who does not walk the roof and map existing intake and exhaust locations before lease execution is leaving a material risk unaddressed.
Evaluating Plumbing Risers for Process and Drain Requirements
A commercial kitchen or wet lab will impose plumbing loads that are multiples of office occupancy: domestic hot and cold water to support multiple sinks, process equipment, eyewash stations and emergency showers (in lab environments), plus drain flows that often include acid waste or high-temperature effluent that cannot be routed into a standard sanitary system.
The domestic water riser evaluation begins with confirming the existing pipe size and material at the riser tap that would serve the tenant's floor. Cast iron or galvanized pipe in older buildings may have reduced interior diameter from scale buildup, meaning the nominal size is not the actual usable size. A flow test or at minimum a camera inspection of the riser should be part of the scope for any serious lab or kitchen evaluation.
Acid waste is a separate system from sanitary drain. Lab tenants working with acid-generating processes need a dedicated acid waste and vent system, typically constructed from polypropylene or borosilicate glass, routed to an acid neutralization tank before connection to the sanitary system. Determining whether the building's floor-to-floor height and slab thickness can accommodate this system — and where the neutralization tank can be located — is a critical step in facility planning for this tenant type.
High-temperature drain from commercial dishwashers, autoclaves and sterilizers must also be evaluated separately. Most municipal codes require that high-temperature effluent be tempered before entering the sanitary system, which means a tempering valve installation at or near the equipment. The space and plumbing rough-in for this equipment must be confirmed against the building's available floor-to-floor height and the routing path to the sanitary stack.
Structural Constraints on New Penetrations
Every new penetration through a concrete or composite slab must be located to avoid reinforcing steel and post-tensioning tendons. In post-tensioned slabs — which are common in commercial construction from the 1970s forward — a tendon strike is a serious structural event that can require engineering assessment, remedial stressing and potentially local slab demolition and reconstruction.
The standard practice before core drilling any post-tensioned slab is ground-penetrating radar (GPR) scanning of the proposed penetration area. A qualified GPR technician can locate tendons, rebar and embedded conduit with reasonable accuracy, allowing the drill crew to position cores in the safe zones between structural elements. This step should be treated as a non-negotiable line item in any lab or kitchen conversion scope.
For steel-framed buildings, the penetration evaluation focuses on beam and joist locations, floor decking orientation, and fire-rated floor-ceiling assembly design. Penetrations through fire-rated assemblies must be fire-stopped with a listed system — the specific fire-stop product and installation method must match the tested assembly design for the authority having jurisdiction to approve the penetration.
Structural capacity is a secondary but equally important question. Lab and kitchen equipment is heavy: fume hoods, biosafety cabinets, autoclaves, commercial refrigeration and walk-in coolers all impose concentrated floor loads that may exceed the design live load of a commercial office floor. A structural review of point load capacity at equipment locations should accompany the riser and shaft analysis, because a building that can accommodate the utilities may still fail on load capacity.
The Electrical Riser: Power Capacity for Intensive Uses
Commercial kitchens and laboratories are among the most power-intensive commercial tenants. A wet lab can require electrical service that is three to five times the load of an equivalent office area; a commercial kitchen can be similarly demanding depending on the equipment schedule. The electrical riser evaluation must go beyond confirming that a feeder tap is available and assess whether the building's main switchgear, distribution panels and riser conductors can support the incremental load.
The starting point is a load study conducted by a licensed electrical engineer, comparing the building's available capacity at the electrical room that serves the tenant's floor against the projected connected load and demand load from the tenant's equipment schedule. For a feasibility evaluation, the equipment schedule does not need to be final — a concept-level list of major equipment categories is sufficient to establish order-of-magnitude demand.
If existing riser capacity is insufficient, the options are typically: upgrade the riser conductors in the existing conduit if it is large enough to accept a larger conductor; add a parallel riser in available shaft space; or install a dedicated transformer and distribution panel fed from a new service entrance. Each option carries different cost, timeline and landlord approval implications, and the adviser should understand which pathway the building's infrastructure favors before lease terms are negotiated.
Generator or emergency power requirements for lab tenants — particularly those handling biological samples or running continuous processes — must also be flagged at the infrastructure evaluation stage. If the building has a generator, confirming its available capacity and the feasibility of connecting the tenant's critical circuits to emergency power is a lease negotiation point, not an afterthought.
Quantifying the Gap Between Existing and Required Capacity
The practical output of a riser and shaft evaluation is a gap analysis: a comparison of what the building currently provides against what the proposed tenant use requires. This gap analysis should be documented in enough detail to support a landlord-tenant negotiation over tenant improvement scope and landlord contribution.
The gap analysis typically covers five dimensions: exhaust shaft area available versus required for the tenant's hood and kitchen exhaust system; domestic water flow capacity versus demand; drain system capacity and compatibility with the tenant's effluent type; electrical capacity versus projected demand; and structural capacity versus equipment point loads and distributed live loads.
Each gap should be assessed for resolution feasibility and rough-order-of-magnitude cost. Some gaps are inexpensive to close — adding a domestic water pressure booster, for example, is a relatively modest scope item. Others are project-defining: a building with no dedicated exhaust shaft and a fully occupied roof may not be convertible to lab use at any reasonable cost.
The gap analysis also informs the tenant improvement allowance negotiation. A landlord who understands that the tenant's use requires a $400,000 exhaust shaft extension — a hypothetical illustrative figure — will price that into the economic package differently than a landlord who discovers the scope mid-construction. Surfacing these costs early, with supporting engineering, gives both parties the information needed to reach a durable agreement.
Sequencing the Evaluation with a Qualified MEP Consultant
The single most common mistake in evaluating buildings for lab or kitchen tenants is sequencing the MEP review after the business terms are agreed. By the time a letter of intent is signed and an MEP engineer is engaged for due diligence, the client is emotionally and commercially invested in the space, and the engineering findings that should have shaped the negotiation instead become sources of delay and conflict.
The right sequence is to engage a qualified MEP consultant for a preliminary feasibility review before the letter of intent is submitted. This review — sometimes called a basis-of-design assessment or a concept-level MEP feasibility — should take two to four weeks and produce a written summary of the key riser, shaft and penetration constraints and their implications for project cost and schedule.
For the exact phrase evaluation that frames this entire methodology, How to Evaluate Risers, Shafts and Penetrations for a Lab or Kitchen Tenant is a discipline that benefits from a standing checklist used across every candidate building. This checklist becomes the adviser's tool for eliminating non-starters early, ranking candidates by infrastructure suitability, and focusing the client's attention on the buildings where a conversion is genuinely achievable.
The MEP consultant's preliminary findings should feed directly into the letter of intent as specific landlord deliverables: shaft access for inspection, access to as-built drawings, confirmation of available electrical capacity, and agreement on the process for structural penetration scanning. A well-constructed LOI converts the infrastructure evaluation from a post-signing risk into a pre-signing condition.
Documenting Findings for Lease Negotiation and Design
The infrastructure evaluation does not end when the LOI is signed — it transitions from a feasibility exercise into a documented record that informs the lease exhibit, the tenant improvement construction documents and the project schedule. The adviser's role is to ensure that the MEP findings are captured in a form that the legal and design teams can use.
The lease should include as an exhibit the MEP feasibility findings or a summary of agreed-upon landlord infrastructure improvements, including the specifications for shaft modifications, fire-stop submittals and utility connection points. Leaving these items to verbal understanding between the parties is a source of construction disputes.
The design team — architect, MEP engineer and structural engineer — should receive the infrastructure evaluation report as part of their project initiation package. This prevents the common situation where the design team discovers a riser conflict during construction documents that the advisers identified months earlier but never formally transmitted.
Connecting Infrastructure Findings to Financial Decisions
Infrastructure constraints are not just technical problems — they are financial variables that belong in the lease economic model. A tenant who signs a lease based on a $150 per square foot tenant improvement allowance and then discovers that shaft modifications will cost an additional $80 per square foot (illustrative hypothetical) has a fundamentally different economic deal than the one modeled at heads-of-terms.
The MEP gap analysis should be translated into cost ranges by the project's cost estimator or MEP engineer and loaded into the financial comparison alongside rent, allowance, free rent and other lease economics. Lease NPV analysis that excludes infrastructure costs will overstate the attractiveness of buildings with significant riser or shaft deficiencies.
Building a Repeatable Scoring Framework
An adviser who handles multiple lab or kitchen assignments benefits from a structured scoring matrix that rates each candidate building on infrastructure dimensions before the client visits the space. This matrix converts a qualitative walk-through observation into a ranked comparison that can be shared with the client and retained as a record of the evaluation methodology.
A practical scoring matrix covers: existing exhaust shaft area (score highest for dedicated shaft with roof access, lowest for no shaft or shared shaft); domestic water riser capacity (highest for confirmed flow test, lowest for no riser above ground floor); electrical capacity margin (highest for confirmed spare capacity at the distribution panel, lowest for maxed switchgear with no room for expansion); slab type and penetration feasibility (highest for mild steel reinforced concrete with GPR record available, lowest for unbonded post-tensioned slab with no tendon records); and acid waste system feasibility (highest for existing acid waste riser or sufficient floor-to-floor height, lowest for insufficient height and no riser).
Each dimension can be weighted by the client's specific use requirements. A molecular biology lab will weight exhaust shaft and acid waste heavily; a commercial ghost kitchen will weight gas riser capacity and grease duct feasibility more. The weighting should be agreed with the client before the scoring begins so that the matrix reflects the actual requirements rather than a generic template.
The scored matrix also supports landlord conversations. A landlord who sees a transparent, documented score for their building — and understands specifically where the building underperforms — is better positioned to respond with a genuine infrastructure commitment than a landlord who is simply told the building "needs work." Specificity in the evaluation translates into specificity in the negotiation.
Using the Evaluation to Guide Lease Drafting
The riser and shaft evaluation should influence specific lease provisions beyond the tenant improvement exhibit. The permitted use clause must be broad enough to cover the tenant's actual operations — a clause drafted for general office use will not permit the installation of acid waste systems, fume hoods or Type I kitchen hoods without amendment. Getting this right at the outset avoids a landlord consent process mid-construction.
The alterations clause should address the process for penetrating floors and shaft walls, including the landlord's right to review and approve structural and fire-stop submittals. If the tenant has negotiated the right to install a dedicated exhaust riser, the lease should specify that the riser is the tenant's property or a tenant improvement that is not subject to removal at lease end, because removing a rooftop exhaust system at expiration can be a significant cost.
The hazardous materials clause requires careful drafting for lab tenants. The permitted use of chemicals, biological materials and compressed gases should be enumerated with specificity, and the tenant's obligations for secondary containment, spill response and regulatory compliance should be cross-referenced to the applicable federal and local requirements. A lease that is vague on hazardous materials creates liability ambiguity for both parties.
Practical Checklist for the Building Walk-Through
No infrastructure evaluation is complete without a physical walk-through that validates the drawn record against field conditions. Drawings lie — or more precisely, they reflect conditions as of a specific date and are rarely updated to reflect every informal modification made over a building's life.
During the walk-through, the adviser and MEP consultant should physically access the mechanical shaft on the tenant's floor, measure the available clear area, and identify every pipe, duct and conduit currently occupying the shaft. Photographs and field measurements should be recorded, not just described in notes.
The roof inspection should map every existing exhaust termination, fresh-air intake and rooftop mechanical unit within the zone where the tenant's exhaust would terminate. Many advisers skip the roof inspection because it requires coordination with building management, but it is consistently where the most expensive surprises are discovered.
The electrical room walk-through should confirm the panel schedule, the available spare circuit capacity and the physical space for new distribution equipment. A panel that is physically full — no room to add breakers or distribution sections — changes the cost and scope of electrical service for the new tenant even if the nominal ampacity appears adequate on paper.
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