Feature Request: Combine property valuations from multiple providers, with manual controls and linked loans

[EnduringGuerila]

Describe the feature

Combine property valuations from multiple providers, with manual controls and linked loans

Summary
Allow property accounts to combine estimates from Zestimate, Realie, RentCast, and manual entry, choose which values contribute to the property’s valuation, and better connect that valuation with its associated loan.

Requested functionality

1. Multiple valuation sources

• Connect any combination of Zestimate, Realie, and RentCast.
• Display each connected provider’s estimate separately on the property account page, including its last-updated date.
• Use the arithmetic average of included, available estimates as the property value for Net Worth calculations.

2. Control which estimates are included in the average property estimated value

• Let users include or exclude each provider’s estimate from the average.
• Excluded providers remain connected, continue updating, and remain visible on the property account page.
• Clearly indicate which estimates contribute to the calculated value.

3. Manual valuation options

• Allow a manually entered value to participate in the average alongside selected provider estimates.
• Alternatively, allow the manual value to override the calculated average entirely.
• Keep provider estimates visible when a manual override is active, and make it easy to return to averaging.

4. Better property–loan linkage
Suggested scope:

• Link a property account to its associated mortgage or other secured loans.
• Show the property value, outstanding linked loan balances, and resulting equity together.
• Provide navigation between the property and its linked loans.
• Keep Net Worth accounting consistent: count the property as an asset and loan balances as liabilities, without subtracting the debt twice.

Example
Zestimate: $400,000
Realie: $420,000
RentCast: $440,000
With all three included, the property value is $420,000. Excluding RentCast gives $410,000, while its estimate remains visible.

Adding a manual value of $430,000 to the
two included estimates produces $416,666.67. Selecting manual override instead sets the property value to $430,000.

Edge cases

• Missing estimates should not count as zero.
• Show when estimates are stale or unavailable.
• If no included values are available, clearly indicate that a manual value or an available source is needed.

Why is this feature important?

Gives users a transparent, configurable property valuation instead of relying on one estimate, while making the relationship between property value, mortgage debt, and equity easier to understand.

Additional context, screenshots, and relevant links

No response