Specifies a command to execute on the remote machine after successfully connecting to the server. The command string extends to the end of the line, and is executed with the user's shell. Arguments to RemoteCommand accept the tokens described in the TOKENS section.
I responded on a different ticket before somoene had pointed out this was the original.
If using a mac, my recommendation is to use iTerm2 and create a profile. Put ssh my_hostname in the command line, and then add the command cd /folder/another_one/much_much_deeper/ in the send text at start field. When you connect to the sessions it will ssh to your hostname and cd to the directory in your case, or execute a command.
man ssh_config. The closest is LocalCommand but it cannot be used for interactive command.
ssh_config? There are probably better places to configure the starting directory, and it would be helpful to understand why there is this particular restriction on a possible solution.
ssh_config" does not make this a duplicate of "do it in Bash". "You can't do that" is a perfectly valid answer.