If you want to sell
You can sell during the term. The lease continues and transfers with the property, so the buyer takes it on with the rent and the term as they stand. Some buyers see a long lease to a public body as an advantage, particularly investors looking for predictable income. Others want vacant possession, which the lease will not give them.
If you want the property back
Only if a break clause was agreed and its conditions are met. Break clauses usually require a set period of notice and can only be exercised at particular points in the term. If there is a realistic chance you will want the property back, negotiate a break clause before you sign rather than hoping to agree one later.
If you remortgage
Tell your new lender about the lease before you apply. A property let on a commercial lease to a government body is assessed differently from one on an assured shorthold tenancy, and not every lender will offer on it. This is manageable but it is not something to discover at the valuation stage.
If the property is damaged
Damage caused during the term is the government body's responsibility under the repairing obligation, and is dealt with by them. Damage from an insured event such as fire or flood is dealt with under your buildings insurance. RentPromise coordinates either way and keeps you informed throughout.
