I also like the speciality paint store (where I go Ben Moore, for example) just for  consistent service and expertise (hit or miss at the big box there).Then hard to beat the old school prep with tsp and  a good sponge mop (just damp) and rinse with clean water (damps sponge mop)...and primer for major color changes or spots  and stains..The good paint in luster you can clean also makes turnarounds easy...clean the walls (as mentioned) and you may only have to touch up..Finally, if you can go with one color/brand for the interiors of your rentals you will save time trying to match color or organize endless paints in your garage...best of luck

Additionally, we appeal our taxes on all properties each year no matter what.Chicago has what seems to be an endless supply of multifamily properties that need to be renovated, which is ideal for our business model.