Separately from all of that - I recommend reviewing your lease up procedures to improve verification of signing tenants and their agreement and aware of terms and conditions. 

It simplifies the process since Zillow handles credit, income, and background checks for a small fee paid by the applicant.Background Check Services: If you prefer not to use Zillow, consider using services like MySmartMove or RentSpree.

In neighborhoods that won't attract high credit score tenants, I've found that a stable job history with a MINIMUM of 1 year at current or previous job to be the best indicator of a great tenant. 

What documents do they require, what credit scores do they allow, how do they verify previous rental history, etc.?

Rehab Scope:Cosmetic remodel: Painted the interior/exterior, updated the kitchen cabinets and countertops, and installed new flooring.Modernized fixtures: Replaced light fixtures, outlets, and switches throughout.Enhanced curb appeal: Painted the brick exterior, added landscaping, and modern black accents.Timeline: Completed the rehab in just 4 weeks to minimize holding costs.Strategic Upgrades: Focused on cost-effective improvements like vinyl flooring and fresh paint, wh What was the outcome?

And it last sold for 3.2 million  now they did add a little in the back and added a bathroom..  684 Encina Grande Palo Alto CA.. lots are worth 2 to 3 mil.. improvements not so much. :) Lol oh ya.

Thats your bonafides to being able to do future deals.As mentioned above, keep your credit perfect.

For me as well as the seller.First, you have to define Sub to financing.Do you mean the reckless kind where you overpay for a property, take over the financing and borrow from others to cover closing costs and holding costs when you have no money, no credit, no income, no reserves and can't tell a warranty deed from a deed of trust and you close on the kitchen counteror do you meanbuying below market value, already having a nice income, having reserves, using escrow and title, already understanding the due on sale clause, have done a lot of creative purchases and know when to use and when not to use creative finance and how to recover if something goes amiss?

@Nate Pucel The depreciation basis for a rental property includes the purchase price plus the cost of renovations and improvements that add value or extend the property's life.

What documents do they require, what credit scores do they allow, how do they verify previous rental history, etc.?