---What vacancy/tenant nonperformance percentage did you use in your ROI projections?

The app also gives you a real time battery life percentage, so you can tell when they're in need of being changed out. 

They want to be a smaller percentage of the investment, so you need to get the $ from somewhere and many start with retail investors.

Or you could promise a certain interest rate then lower the rate by a percentage or two at closing.What can be done in todays market to underpromise and overdeliver?

It takes a lot of money to operate a rental as things break and wear out, tenant issues, unexpected crap that comes out of nowhere… in my experience it takes $300-500/month minimum in capex budget alone and a lot of people only budget $100 or less because they’re using a spreadsheet that recommends a percentage of 5-10% of rent and the rent is too low for that number to be high enough. 

In some municipalities rent works with the property, not the tenant, so that even if a tenant moves out, you can only raise it a certain percentage with the next tenant.

Is there an acceptable max percentage to increase rent? 

There is nothing that ruins a business relationship quicker than poor communication and unexpected fees.Some PMs add a flat fee or a percentage on top of maintenance bills.

This means that the percentage of respondents seeing price increases (29%) exactly matched those seeing price reductions.

And no matter what, straight percentages of the income don't work...unless of course you slide the percentage around for the above-named variables, but at the end of the day your resulting answer will break down to $/unit so you might as well just start there and dump the percentages.