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## New Feature

**Effective Rent Filtering in Unit Mix**

We've added support for filtering by effective rent (after concessions) in addition to asking rent. You can now filter properties by effective rent and effective rent per square foot for all unit types.

**New Filter Fields:**
- `effective_rent`: Filter by average effective rent (net rent after concessions)
- `effective_rent_per_sqft`: Filter by average effective rent per square foot

These filters are available for:
- Overall property metrics
- Individual unit types (studio, 1BR, 2BR, 3BR, 4BR)

**Example Payloads:**

```json
{
  "filters": {
    "unit_mix": {
      "overall": {
        "effective_rent": {
          "min": 1500,
          "max": 2500
        },
        "effective_rent_per_sqft": {
          "min": 3.0,
          "max": 5.0
        }
      }
    }
  }
}
```

You can combine effective rent filters with asking rent filters to compare properties:

```json
{
  "filters": {
    "unit_mix": {
      "two_bedroom": {
        "rent": {
          "min": 2000,
          "max": 3000
        },
        "effective_rent": {
          "min": 1800,
          "max": 2800
        }
      }
    }
  }
}
```

Effective rent filters work the same way as asking rent filters, supporting minimum/maximum values and optional inclusion of properties with null values via the `allow_null` parameter.