From lawaccess.nsw.gov.au comes this suggestion for finding out details of the address of an absentee neighbour so I am guessing the same process would apply for an absentee owner within your strata scheme.
“Your local council will generally have the address and contact details of the owner of the property neighbouring yours. The council may agree to give you this information. You can:
- make an informal application for access to information, or
- fill out an ‘Access Application’ form.”
You could also try a title Search. A last resort may be to employ the services of a solicitor, or a private investigator.
Can you speak to the grandchildren and ask for the address? Can you explain to the grandchildren that preparing and maintaining the strata roll (including an address for service of notices) is mandatory and if not maintained may result in a fine?
SSMA 2015 [s177] and [s178] outline this requirement.
177 Owners corporation must prepare strata roll
An owners corporation must prepare and maintain a strata roll in accordance with this Division.
Maximum penalty: 5 penalty units.
178 Content of strata roll
(1) Information about lots The following information must be recorded in the strata roll in relation to a particular lot in the strata scheme:
(a) the name of the holder of the estate in fee simple in the lot (in the case of a freehold strata scheme) or the holder of the leasehold estate in the lot (in the case of a leasehold strata scheme),
(b) an address for service of notices,
(c) an Australian postal address, and an email address if the holder has one, if not provided as the address for service,
(d) the name of the holder’s agent (if any) appointed in accordance with this Act and the agent’s address for service of notices,
(e) information provided under a strata interest notice,
(f) information provided under a tenancy notice.