In an example like that waiving some late fees to avoid eviction costs, additional nonpayment until eviction, turnover/vacancy costs is well worth considering.

For a low-cost solution, you can create a simple Google form with custom questions and share the link with them.

This is paired with automated prorating of rent and electronic payment setup. 

Your example:1M purchase, sale of $1.4M then a $400K gain is forgetting your rehab and sales costs of approximately $150K, so your real gain is $250K. 

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It's a pain but the post office has a sytem set up for it.I told the tenant I couldn't do anything for him until AFTER Memorial Day and after that I would figure out if we had a spare and get back to him, , but I told him to in the meantime, call the post office, hold the mail, and manually pick it up, and keep looking for the key.

I hired a local handyman by father knew to 'save on repair costs' as opposed to going with one of my usual GC's.

This helps reduce operational costs and increase efficiencies, hopefully giving the landlord back time to spend on other areas of the business.Market Trend Predictive Analytics: There are AI algorithms that can analyze large amounts of data in order to predict property values and future market trends.

Know the trends, the costs per project and needs of the buyers there.  

Cutting down timelines to not extend carrying costs Did you work with any real estate professionals (agents, lenders, etc.) that you'd recommend to others?