What are some of the biggest fees you incur during the due diligence period?

It is possible that you are personally liable for outstanding HOA dues and fees even if you no longer own the unit.

If you're licensed, you could legally collect a real referral fee.

Are the renovation quotes free or should I expect to pay a fee? 

Additionally, to pay an additional $3 per unit to get it in 2 days is a nonstarter.I have found Cozy to be extremely landlord friendly and many of the issues raised in these threads they address (i.e. automatic late fee).

Regardless, the Board adopted regulations that all but eliminated our options to rent the place, including a proposed $250 fee per rental for "administrative costs" and requirements that renters sign an extensive agreement about what they could and could not do on the condo common grounds. 

The fee is very low-5.00 per.

However, if you only live 1 or 2 hours drive from the property, try to still manage it yourself so you can pocket the management fees.

For the moment everything assumes 100% financing)* Repairs (default is $2000)* Vacancy (default is 10%)I also make sure to include HOAs, management fees (which vary based on property type), and insurance (which also vary based on property type, and are just estimates).The list is up to date as of this evening (June 6th), but it's static so it won't be updated unless I update it.

Not really because I found out that, after the real estate agency's 5% fee (30K),  I will have to pay around 30% in capital gain taxes which comes up to a whopping 96K.