I also give them a detailed 11"x17" floor plan with dimensions of each wall that they may need to plan out furniture placements, as well as locations of switched receptacles, cable outlets to plan where to put floor lamps, mount TVs etc...At key handover I give them more detailed package including a list of appliance models and serial numbers, a detailed electrical panel schedule, city mosquito control number, garbage collection schedule for regular waste, recycle waste, yard waste and bulk trash, smoke alarm batteries, storage shed padlocks, location of the secret switch to opens the swinging bookshelf that reveals two more bedrooms.

I thought I would be a furniture maker when I grow up.

My concern is its narrow already and putting a permanent baluster setup is going to make maneuvering furniture around the corner even more difficult. 

I've had to connect sellers with my agent to find a new home, we've even moved furniture out for a seller. 

A serious tone will send the message across better, especially considering its a sale of a property not furniture, or a car.