If you have an unemployed spouse, they could become a realtor to meet the requirement.
Otherwise you can just carry it forward like SeattleCPA said. I had a passive loss that I had to carry forward for 2-3 years when I first started investing in realestate, but have since used it up and now even pay a little tax on my passive income each year as it has edged into positive territory, due to increases in rents and higher cashflow properties with more equity.