On top of estimating items that need to get done now, make sure you set aside 10 to 15k in the unforeseen items that will come up.

If you decide to move forward with a wholesale deal, consider working with an attorney - I help a lot of clients in the Chicago area with their real estate wholesale deals, and it really helps things move along without unforeseen complications. 

30k will go quick and the holding costs/unforeseen expenses on a first purchase will be killers.  

Was it for work, a medical reason, any kind of unforeseen circumstances?  

Do you add a certain percentage to allow for errors and unforeseen issues?

That can be another big unforeseen expense.

In a typical rehab, we'll 5-10% buffer for unforeseen things.

You can possibly qualify for a partial exclusion if you had a valid unforeseen reason to sell after only 3 months, such as health, divorce or job change.

Now, my question is for those of you who are experienced in deal analysis generally how do determine the amount of rent collected per unit that you set aside as a reserve for Cap Ex, emergency repairs and other unforeseen costs?

It gets more complicated when you include the value of your downpayment, closing costs, any unforeseen repairs, vacancies, etc. but it is something I look at for a quick analysis.About the specific location.