And or some kind of fee from the investor as well?

You're inheriting those (some known and some unknown). 

Some of the best opportunities can be found in other regions, particularly in markets known for strong rental performance, stable property values, and tenant demand.

What's the highest success percentage method to find a previous tenant's new address for this? 

No other methods of payment accepted, written into the lease.

Is the only way to pay for a Reno for my childhood home to sell my current home or is there a method I'm not familiar with that I can use my current homes value to help me out??

There is already at least one request with a lot of votes for this feature, and you can allocate your "votes" to it as well...maybe Buildium will start work on it after it gets a few hundred more votes. 

My thought is that the people that ARE using it for lead gen/outreach, automation etc. will keep the methods to themselves until the advantage of early adoption is done and that business segment is saturated, then they will sell courses to everybody else..

Novo also integrates well with various business tools, which might streamline your operations.Business Credit Cards: If you’re looking for a solid credit card option, Capital One Spark Cash Plus offers unlimited 2% cashback and no foreign transaction fees.

These methods include: Detailed Engineering Cost ApproachDetailed Engineering Cost Estimate ApproachSurvey or Letter ApproachResidual Estimation ApproachSampling or Modeling ApproachExperience or “Rule of Thumb” ApproachIt’s important to understand the differences between the approaches including which one best fits your property and the reliability of each approach.DETAILED ENGINEERING COST APPROACHThis approach compiles the costs from construction and accounting reports to build a report.