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Usually yes for your own doors, and that is often the cleanest answer. Your suite runs its own readers and its own credential list, and your staff carry the landlord’s building badge for the perimeter and turnstiles plus a phone credential for your space. It is two credentials, but one of them lives on a device nobody leaves at home.

Worth raising with the landlord anyway: 125 kHz proximity cards transmit a fixed number with no encryption and no mutual authentication, and can be cloned in about fifteen seconds with a device costing under $30. In a single-tenant building that is a manageable risk. Across a multi-tenant tower with a shared lobby it is not, and building owners repositioning space are usually already thinking about it.

It depends on volume and on what you are actually trying to prevent. A guard checking badges is effective and flexible at low volume and completely ineffective at a morning peak, because nobody can visually verify 400 people in twenty minutes. Speed lanes give you a mechanical one-credential-one-person rule and a log entry for every passage.

What they do not do is stop a determined person, and they generate alarms that need a human response. The honest configuration in most Westchester towers is lanes plus a staffed position, where the lanes handle volume and the person handles exceptions. Budget for the accessible lane, the fire-egress behavior of the barriers, and the floor coring. The lanes themselves are rarely the expensive part.

In software. The passenger presents a credential at a lobby terminal, the access system tells the elevator controller who they are and what they are entitled to, and the elevator assigns a car that will only stop where that person is permitted. There is no reader in the cab and no relay wiring at all.

The catch is the integration itself. It has to exist for your specific elevator manufacturer and your specific controller generation, it usually has to be licensed, and it frequently has a lead time measured in weeks. That is a question to ask in the first week of a project, not after the access panels are on the wall. If the integration is not available, the fallback is a traditional cab reader arrangement, which is more wire and a worse passenger experience but works on almost anything.

The controlling figure is the 2010 ADA Standards’ unobstructed side reach maximum of 48 inches, and the standards name card readers explicitly. That is a ceiling, not a target: a reader at 42 to 46 inches to the center is comfortable for standing and seated users alike. Door hardware in the same path has to be operable without tight grasping, pinching or twisting, which rules out certain decorative knobs on an accessible route.

The second rule people miss is that where a state or local accessibility requirement is stricter than the federal one, the stricter requirement governs. In New York that means checking the referenced accessibility standard for the building alongside the ADA figure, rather than assuming they are identical. On a lobby renovation, get the reader heights on the drawings early; moving one afterwards means patching stone.

Yes, and in a leased tower that is the only way it gets done. Cutover happens in stages: new readers and wiring go in alongside the existing system, doors transfer a few at a time outside the morning and evening peaks, and the old system stays live on every door until that door has been tested with real tenant credentials. Tenants keep working through it and nobody re-badges twice.

What we need from the building is access to the risers and the telecom closets, a freight elevator window, and a named contact who can answer questions about tenant boundaries. What you should expect from us is a written sequence in advance, work areas protected and cleaned daily, and a rollback plan for every stage, because the one thing that cannot happen in an occupied building is a door that is neither on the old system nor on the new one at five o’clock.