Or, use Quickbooks and dictate rental items.Personally, I set up a separate bank because I have a few rentals. 

Let those dictate what u buy. 

I see why it is hard to make a generalization regarding amenities because not only does the location dictate certain things, the needs of the property may allow or may not allow for some upgrades because of the ROI.

However, a large amount of the work that dictates if you can close in under 30 days or not is under your control. 

Hi David,If it were mine, I'd call a local Sherwin-Williams store (as close to the beach as possible) and ask them what they think.Ask them if different brands of their paint perform differently in your environment/climate.Then ask them if that's just a guess or if they have a lot of customers in the time range.Keep in mind this will be for decent paint, not cheapy off brand stuff.Also, being a little more specific with the store people might help, because in some beach neighborhoods it's acceptable to let the homes go to very chalky and even peeling before painting, and in some they need to look new all the time or you will be odd man out with the dumpy house.If you are in a some sort of "Community" with a board, or rules, they might dictate how often you must repaint.Good Luck!

However as dictated, contractors are in high demand as well, so this can push back your times.One of the reasons to focus on high quality teams however is they typically have those relationships and cycles down to a t.

Units, location, condition dictates the program that works for each deal.

The state and federal law dictates commission splits for seller (or buyer for that matter) referrals cannot be  paid to an unlicensed party. 

If so, the law dictates how much interest/fees you can charge. 

That will dictate where you'll be able to buy.