Yorkshire???s home games would be subject to the crowd limits, including the Twenty20 Roses match against Lancashire on June 5, while the ground hosts England???s game with Australia on September 11.
Ticket sales for seats in the stand have been suspended, according to the Yorkshire Post, ??with club chief executive Mark Arthur stating the area might not be used again before plans go ahead to rebuild it in time for summer 2019.
He said: ???The upper-floor balustrade at the front of the balcony has been condemned, awaiting a further structural engineer???s report.
???It???s basically corroded at the front of the stand – some of the plaster has come off the front of the balustrade and it???s just not safe. ??
???If somebody leaned against the front of the balustrade they could fall straight over and straight down.???
???Until we know the extent of the problem it???s better to close the stand and not sell any more tickets in case the repairs would prove to be a greater expense than any derived income over the next two years, bearing in mind that we will be rebuilding the stand in time for the 2019??season.
???We simply wouldn???t open the stand unless it was absolutely safe to do so.???
The ground was the scene of England???s famous 18-run victory in the 1981 Ashes series while the ???Headingley Masterplan??? was announced in June 2014 aiming to revamp the stadium.??