You are not supposed to install two neutrals in the same busbar, but as long as both wires are tightly secured, there is no safety danger.

They're trading extremely tight in Chicago from what I've been seeing and people are stretching their numbers to make them work.

The sellers market is of course fueled by tight inventory (houses going on the market one day and 4-7 days after going off the market), low interest rates and also inflation by people taking advantage of snatching up homes/real estate that will significantly appreciate in an inflationary market. 

Also, the market is very very tight right now.

You give them notice of the violation, a deadline for correction, and a follow-up inspection.

HVAC sizing is one of those things that really gets people worked up.The old rule of thumb was one ton per 400 SF.New houses that are well built with tight envelopes and lots of insulation can often hit one ton per 1,000 SF, even in cold climates.The right way to size it is to use a heat load calculation, a blower door test, and validate against your utility bills.A simple Manual J is often off, and I can tell you from experience that most contractors don't do them anyway.

For example, median values of single-family houses and condominiums shot up more than 10 percent across most of the nation last year as a rush of house hunters jumped into the market, chasing an already-tight supply of homes squeezed further by the Coronavirus pandemic that hit early in 2020.

Yes space is tight but think we can manage an 18”.

This is pretty tight, especially with a full time job, which I strongly recommend you keep. 

Large complexes run on a tight budget (or try to--depending on the management).if the danger is super obvious the management company might advise the owner to have the problem solved, but you might want to come in earlier in the game with your tree observations.If you point these tree issues out to potential buyers during the buyers inspection process (when buyers typically develop budgets) you might have more luck.But from an owners perspective--there is always insurance (IF) tree damage occurs above a certain dollar figure worth turning it in for insurance.