The best place to start is analyzing the deal and ensuring your numbers have enough room for errors and potential unforeseen when it comes to the rehab budget.

Property management fees are really expensive and the cost of unforeseen maintenance is not minor either, and every time you have to pay closing costs- that's nothing to sneeze at!

Sellers are far more willing to negotiate now than they have been anytime the past 2-3 years in most markets, so if you can give them the terms they need then you should be able to get a much lower entry price than you would've before which can protect you if the market declines or unforeseen expenses. 

If so, please share and also any unforeseen situations you had come up.  

For example what is it comfortable LTV to maintain over all of the properties and how much liquid cash should I have per property put away in case of vacancies repairs and unforeseen circumstances?

Contractor issues, cost overruns some quite unforeseen, some overlooked.

If you're talking about removing all the walls and replacing the plaster with drywall, all new trim and new floors/sub floor you're going to run into a lot of unforeseen problems.You also have to be careful about who you hire.

For example how long did the project take, did you make enough money for how long you held the property, was there something unforeseen that impacted the duration of the flip or the desired profit?

In a space like real estate where there challenges, variables (seen and unforeseen) natural thinking can be a useful way to overcome and grow.

Can someone please help me understand and give me some advise on any unforeseen issues we may incur and also some other options we can explore.