Managing rental properties effectively means knowing which numbers matter. Beyond the obvious rent collection rate, smart owners track maintenance-cost-per-unit, tenant turnover rate, and average days-to-lease. A healthy portfolio typically shows maintenance costs under 15% of gross rent, turnover below 25% annually, and vacancy periods under 30 days. Property management software from platforms like Buildium or AppFolio can automate these calculations and flag issues before they become expensive problems. The difference between a good property and a great one often comes down to how well you track these leading indicators.