@Elías *******
Some of us already have bank accounts opened before getting a DTV. There is no law that any specific visa is required to open a bank account. It's up the the policy of the bank. Currently all the banks are not opening new accounts for DTV holders and some (mostly Bangkok Bank) are even closing existing accounts. If you already have a bank account then there is nothing illegal about keeping it open and collecting interest income.
About renting a condo you own you have been misinformed. As long as someone else such as a friend or property management company is managing it for you then you don't need a work permit or any special type of visa.
There is no restriction about receiving Thai income as long as you are not working.