diff --git a/dotnet/src/InternalUtilities/connectors/Memory/MongoDB/MongoModelBuilder.cs b/dotnet/src/InternalUtilities/connectors/Memory/MongoDB/MongoModelBuilder.cs
index c8926258bd3c..5f90f3ed9e3e 100644
--- a/dotnet/src/InternalUtilities/connectors/Memory/MongoDB/MongoModelBuilder.cs
+++ b/dotnet/src/InternalUtilities/connectors/Memory/MongoDB/MongoModelBuilder.cs
@@ -23,7 +23,6 @@ internal class MongoModelBuilder() : CollectionModelBuilder(s_validationOptions)
     private static readonly CollectionModelBuildingOptions s_validationOptions = new()
     {
         RequiresAtLeastOneVector = false,
-        SupportsMultipleKeys = false,
         SupportsMultipleVectors = true,
         UsesExternalSerializer = true,
     };
diff --git a/dotnet/src/VectorData/AzureAISearch/AzureAISearchDynamicModelBuilder.cs b/dotnet/src/VectorData/AzureAISearch/AzureAISearchDynamicModelBuilder.cs
index d0689c9b9089..34b02f7ae58f 100644
--- a/dotnet/src/VectorData/AzureAISearch/AzureAISearchDynamicModelBuilder.cs
+++ b/dotnet/src/VectorData/AzureAISearch/AzureAISearchDynamicModelBuilder.cs
@@ -12,7 +12,6 @@ internal class AzureAISearchDynamicModelBuilder() : CollectionModelBuilder(s_mod
     internal static readonly CollectionModelBuildingOptions s_modelBuildingOptions = new()
     {
         RequiresAtLeastOneVector = false,
-        SupportsMultipleKeys = false,
         SupportsMultipleVectors = true,
         UsesExternalSerializer = true
     };
diff --git a/dotnet/src/VectorData/AzureAISearch/AzureAISearchModelBuilder.cs b/dotnet/src/VectorData/AzureAISearch/AzureAISearchModelBuilder.cs
index 31f90d77dd3c..1d7bb64f184e 100644
--- a/dotnet/src/VectorData/AzureAISearch/AzureAISearchModelBuilder.cs
+++ b/dotnet/src/VectorData/AzureAISearch/AzureAISearchModelBuilder.cs
@@ -16,7 +16,6 @@ internal class AzureAISearchModelBuilder() : CollectionJsonModelBuilder(s_modelB
     internal static readonly CollectionModelBuildingOptions s_modelBuildingOptions = new()
     {
         RequiresAtLeastOneVector = false,
-        SupportsMultipleKeys = false,
         SupportsMultipleVectors = true,
         UsesExternalSerializer = true
     };
diff --git a/dotnet/src/VectorData/CosmosNoSql/CosmosNoSqlModelBuilder.cs b/dotnet/src/VectorData/CosmosNoSql/CosmosNoSqlModelBuilder.cs
index fcbd60877571..6ece1dea9dcb 100644
--- a/dotnet/src/VectorData/CosmosNoSql/CosmosNoSqlModelBuilder.cs
+++ b/dotnet/src/VectorData/CosmosNoSql/CosmosNoSqlModelBuilder.cs
@@ -15,7 +15,6 @@ internal class CosmosNoSqlModelBuilder() : CollectionJsonModelBuilder(s_modelBui
     private static readonly CollectionModelBuildingOptions s_modelBuildingOptions = new()
     {
         RequiresAtLeastOneVector = false,
-        SupportsMultipleKeys = false,
         SupportsMultipleVectors = true,
         UsesExternalSerializer = true,
         ReservedKeyStorageName = CosmosNoSqlConstants.ReservedKeyPropertyName
diff --git a/dotnet/src/VectorData/InMemory/InMemoryModelBuilder.cs b/dotnet/src/VectorData/InMemory/InMemoryModelBuilder.cs
index aab0cb1c5d10..817490611f46 100644
--- a/dotnet/src/VectorData/InMemory/InMemoryModelBuilder.cs
+++ b/dotnet/src/VectorData/InMemory/InMemoryModelBuilder.cs
@@ -14,7 +14,6 @@ internal class InMemoryModelBuilder() : CollectionModelBuilder(ValidationOptions
     internal static readonly CollectionModelBuildingOptions ValidationOptions = new()
     {
         RequiresAtLeastOneVector = false,
-        SupportsMultipleKeys = false,
         SupportsMultipleVectors = true
     };
 
diff --git a/dotnet/src/VectorData/PgVector/PostgresModelBuilder.cs b/dotnet/src/VectorData/PgVector/PostgresModelBuilder.cs
index 5b87dbe02d04..19671d6c9b57 100644
--- a/dotnet/src/VectorData/PgVector/PostgresModelBuilder.cs
+++ b/dotnet/src/VectorData/PgVector/PostgresModelBuilder.cs
@@ -18,7 +18,6 @@ internal class PostgresModelBuilder() : CollectionModelBuilder(PostgresModelBuil
     public static readonly CollectionModelBuildingOptions ModelBuildingOptions = new()
     {
         RequiresAtLeastOneVector = false,
-        SupportsMultipleKeys = false,
         SupportsMultipleVectors = true,
     };
 
diff --git a/dotnet/src/VectorData/Pinecone/PineconeModelBuilder.cs b/dotnet/src/VectorData/Pinecone/PineconeModelBuilder.cs
index e71b9effd0f0..fd0565fc72ce 100644
--- a/dotnet/src/VectorData/Pinecone/PineconeModelBuilder.cs
+++ b/dotnet/src/VectorData/Pinecone/PineconeModelBuilder.cs
@@ -15,7 +15,6 @@ internal class PineconeModelBuilder() : CollectionModelBuilder(s_validationOptio
     private static readonly CollectionModelBuildingOptions s_validationOptions = new()
     {
         RequiresAtLeastOneVector = true,
-        SupportsMultipleKeys = false,
         SupportsMultipleVectors = false,
     };
 
diff --git a/dotnet/src/VectorData/Qdrant/QdrantModelBuilder.cs b/dotnet/src/VectorData/Qdrant/QdrantModelBuilder.cs
index a290c303b85e..a4bf583d08ed 100644
--- a/dotnet/src/VectorData/Qdrant/QdrantModelBuilder.cs
+++ b/dotnet/src/VectorData/Qdrant/QdrantModelBuilder.cs
@@ -16,7 +16,6 @@ private static CollectionModelBuildingOptions GetModelBuildOptions(bool hasNamed
         => new()
         {
             RequiresAtLeastOneVector = !hasNamedVectors,
-            SupportsMultipleKeys = false,
             SupportsMultipleVectors = hasNamedVectors,
         };
 
diff --git a/dotnet/src/VectorData/Redis/RedisHashSetCollection.cs b/dotnet/src/VectorData/Redis/RedisHashSetCollection.cs
index b34e50234049..42e4b8b7e63b 100644
--- a/dotnet/src/VectorData/Redis/RedisHashSetCollection.cs
+++ b/dotnet/src/VectorData/Redis/RedisHashSetCollection.cs
@@ -36,7 +36,6 @@ public class RedisHashSetCollection<TKey, TRecord> : VectorStoreCollection<TKey,
     internal static readonly CollectionModelBuildingOptions ModelBuildingOptions = new()
     {
         RequiresAtLeastOneVector = false,
-        SupportsMultipleKeys = false,
         SupportsMultipleVectors = true
     };
 
diff --git a/dotnet/src/VectorData/Redis/RedisJsonCollection.cs b/dotnet/src/VectorData/Redis/RedisJsonCollection.cs
index 80bf560e6563..5c2e327add7d 100644
--- a/dotnet/src/VectorData/Redis/RedisJsonCollection.cs
+++ b/dotnet/src/VectorData/Redis/RedisJsonCollection.cs
@@ -39,7 +39,6 @@ public class RedisJsonCollection<TKey, TRecord> : VectorStoreCollection<TKey, TR
     internal static readonly CollectionModelBuildingOptions ModelBuildingOptions = new()
     {
         RequiresAtLeastOneVector = false,
-        SupportsMultipleKeys = false,
         SupportsMultipleVectors = true,
         UsesExternalSerializer = true
     };
diff --git a/dotnet/src/VectorData/SqlServer/SqlServerModelBuilder.cs b/dotnet/src/VectorData/SqlServer/SqlServerModelBuilder.cs
index c72513e4f913..95938c7b3e9f 100644
--- a/dotnet/src/VectorData/SqlServer/SqlServerModelBuilder.cs
+++ b/dotnet/src/VectorData/SqlServer/SqlServerModelBuilder.cs
@@ -16,7 +16,6 @@ internal class SqlServerModelBuilder() : CollectionModelBuilder(s_modelBuildingO
     private static readonly CollectionModelBuildingOptions s_modelBuildingOptions = new()
     {
         RequiresAtLeastOneVector = false,
-        SupportsMultipleKeys = false,
         SupportsMultipleVectors = true,
     };
 
diff --git a/dotnet/src/VectorData/SqliteVec/SqliteModelBuilder.cs b/dotnet/src/VectorData/SqliteVec/SqliteModelBuilder.cs
index 3f2935fe68ab..4071be017d04 100644
--- a/dotnet/src/VectorData/SqliteVec/SqliteModelBuilder.cs
+++ b/dotnet/src/VectorData/SqliteVec/SqliteModelBuilder.cs
@@ -14,7 +14,6 @@ internal class SqliteModelBuilder() : CollectionModelBuilder(s_modelBuildingOpti
     private static readonly CollectionModelBuildingOptions s_modelBuildingOptions = new()
     {
         RequiresAtLeastOneVector = false,
-        SupportsMultipleKeys = false,
         SupportsMultipleVectors = true,
     };
 
diff --git a/dotnet/src/VectorData/VectorData.Abstractions/ProviderServices/CollectionModel.cs b/dotnet/src/VectorData/VectorData.Abstractions/ProviderServices/CollectionModel.cs
index 544648621050..1d67a7aa2026 100644
--- a/dotnet/src/VectorData/VectorData.Abstractions/ProviderServices/CollectionModel.cs
+++ b/dotnet/src/VectorData/VectorData.Abstractions/ProviderServices/CollectionModel.cs
@@ -77,7 +77,6 @@ internal CollectionModel(
 
     /// <summary>
     /// Returns the single key property in the model, and throws if there are multiple key properties.
-    /// Suitable for connectors where validation is in place for single keys only (<see cref="CollectionModelBuildingOptions.SupportsMultipleKeys"/>).
     /// </summary>
     public KeyPropertyModel KeyProperty => this._singleKeyProperty ??= this.KeyProperties.Single();
 
diff --git a/dotnet/src/VectorData/VectorData.Abstractions/ProviderServices/CollectionModelBuilder.cs b/dotnet/src/VectorData/VectorData.Abstractions/ProviderServices/CollectionModelBuilder.cs
index de8456e70fb4..03dcb9d48e9a 100644
--- a/dotnet/src/VectorData/VectorData.Abstractions/ProviderServices/CollectionModelBuilder.cs
+++ b/dotnet/src/VectorData/VectorData.Abstractions/ProviderServices/CollectionModelBuilder.cs
@@ -57,14 +57,7 @@ public abstract class CollectionModelBuilder
     /// Constructs a new <see cref="CollectionModelBuilder"/>.
     /// </summary>
     protected CollectionModelBuilder(CollectionModelBuildingOptions options)
-    {
-        if (options.SupportsMultipleKeys && options.ReservedKeyStorageName is not null)
-        {
-            throw new ArgumentException($"{nameof(CollectionModelBuildingOptions.ReservedKeyStorageName)} cannot be set when {nameof(CollectionModelBuildingOptions.SupportsMultipleKeys)} is set.");
-        }
-
-        this.Options = options;
-    }
+        => this.Options = options;
 
     /// <summary>
     /// Builds and returns an <see cref="CollectionModel"/> from the given <paramref name="type"/> and <paramref name="definition"/>.
@@ -419,7 +412,7 @@ protected virtual void Customize()
     /// </summary>
     protected virtual void Validate(Type? type, VectorStoreCollectionDefinition? definition)
     {
-        if (!this.Options.SupportsMultipleKeys && this.KeyProperties.Count > 1)
+        if (this.KeyProperties.Count > 1)
         {
             throw new NotSupportedException($"Multiple key properties found on {TypeMessage()}the provided {nameof(VectorStoreCollectionDefinition)} while only one is supported.");
         }
diff --git a/dotnet/src/VectorData/VectorData.Abstractions/ProviderServices/CollectionModelBuildingOptions.cs b/dotnet/src/VectorData/VectorData.Abstractions/ProviderServices/CollectionModelBuildingOptions.cs
index 3fe17a327b70..28ae1f026af0 100644
--- a/dotnet/src/VectorData/VectorData.Abstractions/ProviderServices/CollectionModelBuildingOptions.cs
+++ b/dotnet/src/VectorData/VectorData.Abstractions/ProviderServices/CollectionModelBuildingOptions.cs
@@ -11,11 +11,6 @@ namespace Microsoft.Extensions.VectorData.ProviderServices;
 [Experimental("MEVD9001")]
 public sealed class CollectionModelBuildingOptions
 {
-    /// <summary>
-    /// Gets a value that indicates whether multiple key properties are supported.
-    /// </summary>
-    public required bool SupportsMultipleKeys { get; init; }
-
     /// <summary>
     /// Gets a value that indicates whether multiple vector properties are supported.
     /// </summary>
diff --git a/dotnet/src/VectorData/Weaviate/WeaviateModelBuilder.cs b/dotnet/src/VectorData/Weaviate/WeaviateModelBuilder.cs
index 9a1f429849de..c535ede3cb0d 100644
--- a/dotnet/src/VectorData/Weaviate/WeaviateModelBuilder.cs
+++ b/dotnet/src/VectorData/Weaviate/WeaviateModelBuilder.cs
@@ -18,7 +18,6 @@ private static CollectionModelBuildingOptions GetModelBuildingOptions(bool hasNa
         return new()
         {
             RequiresAtLeastOneVector = !hasNamedVectors,
-            SupportsMultipleKeys = false,
             SupportsMultipleVectors = hasNamedVectors
         };
     }
diff --git a/dotnet/test/VectorData/VectorData.UnitTests/CollectionModelBuilderTests.cs b/dotnet/test/VectorData/VectorData.UnitTests/CollectionModelBuilderTests.cs
index 0bc26fea1ef5..1fb1961e7883 100644
--- a/dotnet/test/VectorData/VectorData.UnitTests/CollectionModelBuilderTests.cs
+++ b/dotnet/test/VectorData/VectorData.UnitTests/CollectionModelBuilderTests.cs
@@ -368,7 +368,6 @@ private sealed class CustomModelBuilder(CollectionModelBuildingOptions? options
     {
         private static readonly CollectionModelBuildingOptions s_defaultOptions = new()
         {
-            SupportsMultipleKeys = false,
             SupportsMultipleVectors = true,
             RequiresAtLeastOneVector = false
         };