This usually makes for more visually pleasing neighborhoods.

Local Lead Inspection means an inspection that includes a visual assessment of a residential rental property, followed by the collection of environmental samples to determine the presences of presumed lead hazards.

Here is a visual resource for you.

In all but the most unusual cases, a simple visual check will tell you whether the vent is properly terminated/capped, so I would expect my PM to be on top of that.As far as cleaning the vents, I agree, they should be cleaned every few years. 

Business Model Generation" by Alexander Osterwalder and Yves Pigneur: A great resource that introduces a visual chart to describe your business's value proposition, infrastructure, customers, and finances.Personal Growth/Values:"Atomic Habits" by James Clear: A guide on how small changes can lead to significant improvements in one's life.

Watching calisthenics athletes pull off incredible bodyweight feats to some hype up music makes me visualize what is possible and what perfect form looks like.

@Coban ScottRentcast.io is an extremely helpful resource that provides clean, visual rental comps. 

It's sometimes helpful to itemize what capabilities matter and work backwards from there to visualize which suite best matches your needs.

It could be one less item to maintain/repair in the future, but the home may be less visually appealing to tenants.

In regards to your question about buying the rate down, I like to break it out into your 'break-even period' to visualize how long it will take to recoup your funds paid upfront.