Are either of these areas far enough away to not have too much headache factor associated?

Mold remediation is not cheap and I'm sure there is at least one hidden surprise you would uncover if you did this deal, so be sure to add a 10% overage factor for whatever your contractor friend estimates. 

Homeowner would like to move the vent to a new location, as they don't like the current design (which was original to the house... not something we changed.

As a commercial property manager, I've obtained many quotes to paint parking stripes and each stripe is typically $5-8/each once you factor in labor.

most people will look at square footage, number of bedrooms, cap rate, any necessary repairs, and of course the biggest factor location.

Well I guess that more so would depend on a few different factors such as the condition of the house, rehab costs, the relocation costs, new comps of new neighborhood, any permits that have to be acquired and probably several other factors I'm unaware of. 

A better question to ask might be: "If you design an estate plan for my family, will it actually accomplish what I expect it to?" 

When fix n flipping you have unknowns, "fudge factor" you have to account for.

There are a number of different factors at play here.  

I’m a realtor and my fiancé and I run an interior design business together.