Decade-Scale Test for Selling a Unit to Fund a Move

A family-held business weighing a costly relocation faces one decision: sell a unit, or keep carrying a site that is draining cash. The tempting answer is the sale. The safer answer is to test the buyer's exit horizon against a ten-year plan, because the exit date matters more than the purchase price.

A sale funds a transformation only when that date can be written into the plan without breaking continuity. For a long-lived company, the question is rarely whether the current site is expensive. It is whether the family can carry that cost while it rebuilds the rest of the business. Holding costs can reduce the balance sheet, and a transformation can outstrip the cash the owner is willing to commit. A divestiture can look like the only way to keep the core alive.

Marshall, a family-owned parent in Cambridge, agreed to sell its aerospace unit to Aurelius Group, a private equity firm based in Germany. The package included Cambridge Airport and the Cambridge Aero Club. The deal is expected to close by late September 2026. Aurelius committed to leaving the Cambridge site no later than the end of June 2029.

A known departure date gives the owner a planning period. An open-ended stay gives the owner a negotiation that never ends. With a fixed date, the family can sequence the relocation, protect the workforce, and keep the core business from being constrained by a site it can no longer afford.

A fixed exit date turns a sale into a bridge

The strongest objection is that a private equity buyout turns a family business into a portfolio asset. The owner may lose control, the workforce may feel abandoned, and the next owner may cut what the family built. That fear is real. It is also manageable when the sale is structured as a bridge, not a handover.

Marshall reported a £55.5 million loss in 2024 and cut more than 300 jobs. It had already cancelled a proposed move to Cranfield Airport in Bedfordshire the previous October, saying the move was no longer affordable. Marshall's board said Aurelius could support the aerospace business's relocation and future investments through access to funding.

The deal shows the test. The holding cost had become a constraint on the company's ability to move. The buyer's capital could fund the move. The buyer's exit date gave the family a finite period to plan around. If any one of those pieces were missing, the transaction would have been harder to defend. Customer confidence in the core business also needs protection during the transition.

For a family business, the real risk is a decision that looks reasonable in the current year and then collapses the next decade. The sale should be judged by how it changes the succession path. The family should also ask whether the sale preserves enough scale for the next owner to make meaningful choices and let compounding value rebuild the core. If the core business becomes smaller, the next generation may inherit a narrower role. If the sale funds a stronger core, the family may inherit a more durable company.

The buyer's departure date is the real term sheet

A private equity buyer often brings money, but money is not the only term. The exit date decides whether the family can keep its plan. A fixed departure date can be written into the succession plan, the workforce plan, and the capital plan.

Before signing, ask whether the buyer's capital is enough to finance the transformation, not merely to cover the current site. The exit date also needs room for the relocation to be completed without breaking customer commitments. The transition itself should strengthen the workforce, not weaken it.

Document the transition milestones, funding conditions, and workforce commitments in the same plan, with dates that the family can check at regular intervals. That documentation makes the buyer's departure a scheduled event, not an open question.

Use the holding-cost exit rule before signing

Sell the unit only when all three conditions hold:

• the cost of holding the site exceeds the long-term value of the unit;
• the buyer's capital funds a transformation the owner cannot finance;
• the buyer's exit date can be written into a ten-year plan without breaking continuity.