Source: p 335, Investing For Canadians For Dummies, 3 Ed (2009) by Tony Martin, Eric Tyson
If the company leases its space, what does the lease contract say?
¿ A soon-to-expire lease at a low rate can ruin a business’s profit margins. ¿ With a retail business, the ability to maintain a good location is also vital. Check comparables — that is, what other similar locations lease for — to see whether the current lease rate is fair, and talk to the building owner to discover his plans for the building. Ask for and review (with the help of a legal adviser) the current owner’s lease contract.
I don't understand the sentence that I surrounded with ¿.
- How does a lease do so? A business must pay for its lease regularly? 
- How does a low rate exacerbate the ruin? Should it not reduce the ruin? 
