City policy as of March 18:

All City of Toronto tennis courts are to remain closed through April 5. This includes clubhouses as well. This is consistent with the direction that all City facilities remain closed until this date.
Parks staff will be posting signs indicating these closures and will monitor the clubhouses by visiting once a week.
Any planned work or cleaning by clubs will need to be postponed until this date.
Water access at clubhouses will be turned back on as seasonal staff are brought back on.
Questions related to an extension of the tennis season or permit fees will be addressed at a later date as this is an evolving situation.