Building the analytics layer multifamily never had
Property managers running 50–500 units are sophisticated operators who know their numbers matter. Rentnoi exists to give them the NOI visibility that enterprise operators have — without requiring an enterprise analytics team to run it.
Mid-market multifamily is flying blind
Property managers running 50–500 units are sophisticated operators. They know their numbers matter. But their data lives in three systems — a property management platform, a spreadsheet, and memory. Rentnoi changes that.
The enterprise property management world has CoStar, RealPage Analytics, and full-time data teams. The small landlord world has simple apps. The middle — operators running several hundred units across multiple properties — has spreadsheets and manual reconciliation.
Rentnoi is built for the middle. The operators who are sophisticated enough to know what NOI drivers matter but don't have the engineering resources to build custom analytics on top of their PMS.
Three levers: maximize revenue, control expenses, optimize leasing velocity. Rentnoi maps all three — in one platform — from your existing property management data.
Founded in Denver
Rentnoi was founded by CEO Sienna Kowalski, who spent five years in property operations roles at two mid-market multifamily companies in the Denver metro before founding Rentnoi. The frustration was always the same: the data to make better NOI decisions existed in the PMS, but getting it into a usable form required half a day of manual work that nobody had time for.
Rentnoi raised a $275K angel round in September 2025 to build the analytics layer — and started with the specific problems operators kept describing: expense variance they couldn't see in real time, rent roll gaps that weren't obvious until reconciliation, and lease expiration clusters that caught teams off guard.
The company is headquartered at 1515 Arapahoe Street in Denver — in the Denver proptech ecosystem, which has become one of the stronger centers for multifamily technology development in the Mountain West. Our team is 8 people as of 2025, all Denver-area.
5 years multifamily operations before founding Rentnoi. Denver-based. Focused on building tools operators actually use.
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We're hiring in Denver and building for operators across the Mountain West.