for children and comprehensive housing search assistance for households that receive a voucher for tenant-based assistance. (8) Timing of demolition or disposition The grantee shall not commence demolition or complete disposition of a building subject to the approved transformation plan until all residents residing in the building are relocated. (9) Timing of relocation The applicant shall not commence relocation before approval by the Secretary of the transformation plan providing for the demolition or disposition, unless the applicant generally relocates residents in accordance with this section, as determined by the Secretary, except in the case of a substantial and imminent threat to health or safety. (e) Monitoring of displaced households (1) Grantee responsibilities To facilitate compliance with the requirement under subsection (a) (relating to right of residents to return), the Secretary shall, by regulation, require each grantee of a grant under this section, during the period of the transformation plan assisted with the grant and until all funding under the grant has been expended— (A) to maintain a current address of residence and contact information for each household affected by the transformation plan who was occupying a dwelling unit in the housing that is subject to the plan