What Counts as a Single Site of Employment

Everything numerical in the federal statute is counted at a single site of employment. The fifty employment losses that make a plant closing, the thirty-three percent and the five hundred that define a mass layoff, and the aggregation windows are all applied at a site. The definition of the site therefore decides the outcome more often than the count does, and it is set out in eight paragraphs of the regulation that have to be read together rather than picked from.

When separate places are one site

The starting point is generous. A single site of employment can refer to either a single location or a group of contiguous locations, and groups of structures forming a campus or an industrial park, or separate facilities across the street from one another, may be considered a single site. Physical adjacency alone can do the work.

The regulation then extends grouping beyond adjacency. Separate buildings or areas that are not directly connected or in immediate proximity may still be a single site if they are in reasonable geographic proximity, used for the same purpose, and share the same staff and equipment. All three conditions are stated conjunctively. The example given is an employer managing several warehouses in an area who regularly shifts or rotates the same employees from one building to another.

That example identifies what the test is really about. Shared staff is the strongest indicator, because a workforce that moves between locations experiences them as one workplace, and the statute is concerned with the effect of a shutdown on a workforce and a community. Distance is a proxy for that, not the object of the inquiry.

Two related terms sit underneath the site and are often confused with it. A facility means a building or buildings. An operating unit means an organizationally or operationally distinct product, operation or specific work function within or across facilities at the site. Those terms matter for the closing threshold, which reaches the shutdown of a facility or an operating unit within a site, but they do not divide the site for counting purposes. Employment losses are aggregated across the whole site even where only one unit closed.

When adjacent places are separate sites

Two provisions cut the other way, and they are the ones employers overlook. Non-contiguous sites in the same geographic area that do not share the same staff or operational purpose should not be considered a single site; the regulation's example is two assembly plants on opposite sides of a town, managed by a single employer, which are separate sites if they employ different workers. And contiguous buildings owned by the same employer that have separate management, produce different products and have separate workforces are separate single sites of employment.

The second of those is the sharper rule, because it defeats adjacency directly. Two buildings sharing a fence line can be separate sites where the management, the product and the workforce all differ. Again the conditions are cumulative: shared management or a common workforce will pull the buildings back together even where the products differ.

A third provision addresses shared premises from the opposite direction. There may be several single sites of employment within a single building, such as an office building, where separate employers conduct activities in it. An office building housing fifty different businesses contains fifty single sites of employment, and each employer's offices are its own site.

Read together, these provisions describe a test with three inputs rather than one. Physical relationship is the first, and by itself it can group or separate nothing. Operational purpose is the second, asking whether the locations exist to do the same thing. Workforce and management are the third, and in the regulation's examples they are decisive: the warehouses are one site because the same people rotate through them, and the adjoining buildings are separate because the people and the managers do not overlap.

Mobile crews, outstationed staff and home bases

For workers whose primary duties require travel from point to point, who are outstationed, or whose primary duties involve work outside any of the employer's regular employment sites, the regulation names three examples: railroad workers, bus drivers and salespeople. Such workers belong to the single site they are assigned to as a home base, from which their work is assigned, or to which they report.

The rule is administratively convenient and substantively consequential. It concentrates a geographically scattered workforce at one address for counting purposes, which can turn a reduction that looks dispersed into a mass layoff at a single dispatch office or regional headquarters. The three phrases in the rule are alternatives rather than a sequence, and where they point to different addresses the choice has to be made and recorded, because it determines both the count and the local government that must receive notice under the required contents and recipients of the notice.

The regulation says nothing directly about employees who work from home. The home base provision is the nearest text and is generally applied by analogy, which places a remote worker at the location managing them. Because the regulation does not address the arrangement in terms, the reasoning behind the assignment matters more than usual, and an employer should be able to explain it from the facts rather than from convenience.

The residual rule and the limit on all of them

The regulation ends the definition with two sentences that do a great deal of work. The term may also apply to truly unusual organizational situations where the stated criteria do not reasonably apply. And the application of the definition with the intent to evade the purpose of the statute to provide notice is not acceptable.

The second sentence is the operative one. It converts the site definition from a technical exercise into one where the sequence of decision-making matters. A site boundary drawn as part of ordinary organizational practice, before any reduction was contemplated, is evidence of itself. A boundary drawn after the reduction was planned, producing a division that nobody used for any other purpose, invites the conclusion the sentence describes. The same concern animates the anti-evasion language attached to the aggregation rules examined in aggregating reductions over a rolling period, and the two provisions are frequently argued together, because both go to whether the thresholds set out in the plant closing and mass layoff triggers were reached.