What is the typical initial outlay when renting a property in Thailand for the first time?

How it usually works:

To sign the rental agreement you need 3 months of rent. 2 months security deposit and the first month of rent.

There are some laws about some properties only being legally allowed to charge 1 month security deposit, but there's no enforcement and no way to fight it, so if you only want to pay one month of rent as a security deposit then you keep looking for a new room who is willing to offer that.

So for what you should expect, it's 3 months of rent to get into the building.

Make sure you document any existing damage with pictures and an inventory sheet to protect yourself and your deposit money. Also make sure you are being direct billed for electricity and water, rather than the owner billing you, because they always inflate the rate. That's much more common in apartments than condos though.

Finally make sure the lease clarifies who is responsible for what kind of maintenance or issues with appliances such as washing machine, refrigerator, air conditioner, etc.

2+1

2 months deposit + 1 months rent is pretty standard