---
title: Use unknown values in List Builder filters
description: Learn how to input unknown values and include no max/min logic in your filters for wider results.
---

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# Use unknown values in List Builder filters

## Learn how to input unknown values and include no max/min logic in your filters for wider results.

Invelo’s [advanced filtering system](https://helpdesk.inveloapp.com/filter-your-records?hsLang=en) empowers you to pinpoint the exact prospects, leads, and deals you need by combining multiple criteria for highly targeted searches.

Filtering for unknown values helps identify gaps in your data, ensuring you can clean, update, or strategically target records that may otherwise be overlooked.

---

This article helps you understand how to use this powerful filter feature for property, ownership, MLS, valuation and equity, and preforeclosure filters. 

### Property filters

- Year built - no min includes unknown, no max includes highest year
- Lot size (sf) - no min includes unknown, no max includes highest amount
- Lot size (acres) - no min includes unknown, no max includes highest amount
- Building area - no min includes unknown, no max includes highest amount
- Number of stories - no min includes unknown, no max includes highest amount
- Number of units - no min includes unknown, no max includes highest amount
- Floor to area ratio - no min includes unknown, no max includes highest amount

### Ownership filters

- Years of ownership - no min includes 0, no max includes unknown
- Last sale date - no min includes unknown, no max includes highest date
- Last sale price  - no min includes unknown, no max includes highest amount
- Tax delinquent year - no min includes unknown, no max includes highest year

### MLS filters

- Listing date - no min includes unknown, no max includes highest year
- Listing price - no min includes unknown, no max includes highest amount
- Days on market - no min includes unknown, no max includes highest days
- Canceled listing date - no min includes unknown, no max includes highest date 

### Valuation & Equity

- Assessed land value - no min includes unknown, no max includes highest amount 
- Assessed improved value - no min includes unknown, no max includes highest amount 
- Assessed total value - no min includes unknown, no max includes highest amount
- Assessed improved % - no min includes unknown, no max includes highest amount 
- Estimated equity - no min includes minus values and 0, no max includes 100 
- Estimated equity % - no min includes 0, no max includes 100

### Preforeclosure

- Recording date - no min includes unknown, no max includes highest date 
- Auction date - no min includes unknown, no max includes highest date 
- Default amount - no min includes unknown, no max includes highest amount 
- Release date - no min includes unknown, no max includes highest date 
- Opening bid amount - no min includes unknown, no max includes highest date 

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