One color and sheen spec per property
A property that repaints each unit in whatever off-white the last painter had on the truck ends up with walls that differ from unit to unit, and a touch-up that shows as a patch. The cure is a written specification: one wall color, one ceiling color and one trim color, each with a sheen, kept on file for the whole property so any painter can match any unit.
Sheen matters as much as color. Flat paint hides imperfections but does not wash well, which suits ceilings and damaged walls. Eggshell and satin wash far better, so they suit living areas, kitchens and bathrooms, while semi-gloss is the usual choice for trim and doors because it shrugs off scuffs. A spec that names the sheen for each surface is what lets a second visit match the first.
The first time we turn a unit at a property, we record the spec by product, color name and sheen, and we brush out a sample on a wall you approve before that color goes into a second unit. Color choice also affects smell. Each ounce of colorant added to tint a paint can carry 5 to 20 grams of volatile organic compounds, so a light neutral spec keeps a freshly painted unit from following the next tenant in with a strong odor.