Rent varies block to block, so this uses your own numbers rather than a citywide average. Move the sliders to your best estimate and see the rough payback timeline.
The share of the year the unit sits empty between tenants - turnover, repairs, finding the next renter. 5-8% is typical for a stable rental; go higher if you expect shorter tenant stays or more time between leases.
Uses your own inputs, not a market average - rent varies too much block to block for a single citywide number to mean anything. Does not include property tax changes, insurance, maintenance, or financing cost, which affect the real return. An honest planning estimate, not a pro forma.