The leasing agent is talking about the floor-to-ceiling glazing and the daylight. The CIO is watching the signal bars on their phone disappear as they walk the bare floor plate, doing the math on the rent per square foot anyway. Nobody says anything because the meeting is about square footage and lease terms.
Months later, on the first Monday in the new space, half the staff is taking calls from the concrete stairwell because it is the only place with two bars of signal.
The facade is an RF decision whether or not anyone on the design team knows it. Energy codes and green building standards push toward tighter envelopes, low-emissivity coatings, foil-faced insulation, and reflective films. The microscopic metallic oxide layers on the glass reflect infrared light to keep the building cool. They also attenuate radio frequency signals. Reinforced concrete, metal decking, and radiant barriers act as shields. The building passes its energy model and functions beautifully as a partial Faraday cage.
Ten years ago, a telecom carrier would pay to light up a new office building with cellular coverage to win a corporate account. They funded the in-building distributed antenna systems to eliminate network blind spots. Today, macro networks are dense enough that carriers view indoor dead zones as a private facility problem. They provide the signal source at the property line; the enterprise pays for the distribution inside, or nobody does.
This economic shift collided with the decommissioning of the desk phone. The mobile device is now the primary line for most knowledge workers. When the desk phone retires, the cellular signal stops being a convenience and becomes a business continuity requirement.
IT departments often assume Wi-Fi calling will close the gap. It mitigates the problem for managed devices on a well-designed wireless network. It does not cover guests, contractors, delivery drivers, or the fire marshal. Emergency call routing and location over Wi-Fi remain weak points. Handoffs between access points, or between Wi-Fi and the macro cellular network, drop calls exactly when people are walking to a meeting. Wi-Fi calling is a patch for bad coverage, not a substitute for it.
Then there is the local fire code. Authorities increasingly mandate dedicated emergency responder radio coverage inside structures, particularly in heavy concrete areas like fire stairs, basements, and elevator shafts. An inspector walks the emergency stairwells with a handheld radio. On the third floor down, the radio crackles into silence. The inspector writes up a failure notice. The certificate of occupancy is denied until a bi-directional amplifier system is engineered, installed, and certified.
The public safety radio system and the commercial cellular system share a closet and nothing else, unless the design team makes them share. Emergency responders operate on specific, reserved frequencies separate from commercial cellular networks. A building might have perfect commercial cellular coverage but fail the emergency radio test, or vice versa. If the code forces a public-safety system into the building, engineering it to carry commercial bands adds marginal cost compared to building a second system later.
Coverage is a lease term, not a facilities ticket. Real estate teams negotiate fit-out allowances based on HVAC, lighting, and carpets. If in-building cellular is not in the lease, it is the tenant’s problem, at the tenant’s cost, on the tenant’s schedule. The landlord controls the roof, the risers, and the power. Even if the tenant pays for the system, they need the landlord’s cooperation and signature to install it.
This creates an ownerless problem. Facilities owns the shell. IT owns the network. Security owns the radios. The landlord owns the building. The carrier owns the spectrum. Procurement wrote the lease. Nobody owns the question of whether a call connects from the far corner of the floor plate.
Fixing it requires choosing a system and navigating the approval gauntlet. A passive repeater uses a donor antenna on the roof and amplifies the off-air signal. It is cheaper, but if the donor signal is poor, it amplifies noise, and it typically supports only one carrier or a limited number of bands. An active distributed antenna system uses a head-end with fiber to remote radio units, supporting multiple carriers and bands, but it requires a dedicated closet, power, and cooling. Small cells place carrier-owned radios on the enterprise LAN, which introduces power, VLAN, and security posture questions.
Any active system on licensed spectrum needs the license holder’s sign-off. Amplifying licensed spectrum without the carrier’s agreement is a legal problem with an antenna. Multi-carrier systems require multiple sign-offs. The carrier review processes are serial and slow. The approval gauntlet often takes longer than the physical installation, making it the critical path on a move-date plan that was never built to accommodate it.
Even after the system is installed, coverage is not a fixed property of the building. Carriers refarm spectrum, move capacity to higher frequencies, and decommission towers. Higher bands penetrate poorly and do not travel far. Newer generations on higher bands are often worse indoors than the generations they replace. Refarming is the quietest way to lose coverage: nothing in the building changed, but the macro network shifted under a ten-year lease.
The useful procurement question is not simply whether the building has coverage. It is who will test it, who can install a remedy, who pays for that remedy, and whether the work can finish before occupancy. Test coverage as a due-diligence item before the lease is signed. Walk the bare floor plate with a phone on each carrier the staff actually uses. Put the access rights, equipment space, and construction routes in the lease. Assign an owner for the outcome. Test again after the walls are up, because coverage as-designed and coverage as-built are different numbers.