There are unit refresher costs (paint, cleaning) between tenants and there are maintenance costs (fixing the fence, replacing the faucet) that don't go away, they just can be pushed off.

My mortgage company specializes in pre-approvals for investment properties, so I feel like I need a refresher on the first time home buyer.What are first time home buyers looking for/needing from their lender?

Jerryll nailed it with his thought process.I've done house flips where I knew the profit would only be ~$25k at the end of the day, but those houses just needed a quick and easy refresh before re-listing for sale just weeks after I bought the deal.Then on the other end of the spectrum I have deals I'm pursuing that have a best case scenario net profit of $1M+ which require a ~2 year build out an a team of world class architect and builder to pull off. 

They money you plan to allocate for windows and a slider may be better spent in a kitchen or master bath refresh.

Sometimes it is refreshing to hear that they are no familiar with XYZ or unsure of an answer. 

Just a basic refresh What was the outcome?

., that is never intended to be eternal, it's like socks, there made for use and then to be refreshed at certain intervals. 

Ultimately buyers or renters are willing to pay more when they feel like they are getting something new or refreshed.

-going off of DIY, I like to keep a list of links to awesome DIY youtube videos/channels for reference on certain jobs to quickly refresh myself if it's been a while.   

Just a refresh in the kitchen -- tear out the old ceramic 12" tile floor and replace with the same LVP as the bath.