The legislator never claims that this fear is unfounded. Instead, she provides evidence for why the city can accept the streetlights despite that fear: even if it’s true that the company wants influence, they won’t be able to get it.

This rephrases the conclusion that there is no problem with the city accepting the gifted streetlights.

The legislator acknowledges that the lighting company desires this opportunity, but she doesn’t say the opportunity is inappropriate or unique.

This is a premise. It is evidence for why there’s no problem with the city accepting the gifted streetlights; favoritism would be prevented by the city’s bidding process.

This is a premise. The legislator believes this opportunity is the only ulterior motive for the gift, supporting the conclusion that accepting the gift would be unproblematic.