Providing a starter supply of items like laundry detergent, dryer sheets, and toiletries is common practice and works well for short stays.

Time and practice will still teach you as you do deals but it will help you understand what things costs for the size of the property 

Account ClosedAdding your property manager as "additional insured" is standard practice and beneficial for you.

Start by educating yourself with foundational books like The Millionaire Real Estate Investor and practicing deal analysis using tools like BiggerPockets calculators.

Heck, even within offices, the small 1-tenant office buildings suitable for a dental practice or law practice, those are in a very different world. 

Its simple in practice, however you need to make sure the numbers work.

Most look at a Certificate of Insurance and confirm coverage limits but best practices are to (1) become added as additional insured under contractors policy and (2) understand coverage exclusions which are not going to be detailed on an insurance certificate.

Quote from @James Hampton: That's a bad practice to follow.If an occupant is not named on the lease, you may have difficulty enforcing rules or evicting them.

Another common practice for nationally sparse datasets such as tax data is aggregation.

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