IT DEPENDS ON THE SITUATION. IF THE OWNER DOES'NT LEAVE ON THE PREMISES,
AND HE/SHE HAS NO SUPER THAT LEAVES THERE, I THINK HE SHOULD HAVE ONE TENANT THAT HE TRUST TO HAVE A COPY OF THE KEY IN CASE OF EMERGENCY. OTHERWISE HE /SHE WILL HAVE TO BE AVAILABLE WHENEVER THERE IS A NEED FOR ACCESS TO THE BASEMENT.
please specify why you think you need access to the basement? is it a private house or an apartment
building, is your electric box down there. not sure what your asking or why so we can possibly help you
otherwise you can call the department of housing.