diff --git a/src/AggregateFunctions/WindowFunction.h b/src/AggregateFunctions/WindowFunction.h
index f7fbd7389ea..be214f4c824 100644
--- a/src/AggregateFunctions/WindowFunction.h
+++ b/src/AggregateFunctions/WindowFunction.h
@@ -78,11 +78,6 @@ struct WindowFunction : public IAggregateFunctionHelper<WindowFunction>, public
     }
 
     String getName() const override { return name; }
-    void create(AggregateDataPtr __restrict) const override { }
-    void destroy(AggregateDataPtr __restrict) const noexcept override { }
-    bool hasTrivialDestructor() const override { return true; }
-    size_t sizeOfData() const override { return 0; }
-    size_t alignOfData() const override { return 1; }
     void add(AggregateDataPtr __restrict, const IColumn **, size_t, Arena *) const override { fail(); }
     void merge(AggregateDataPtr __restrict, ConstAggregateDataPtr, Arena *) const override { fail(); }
     void serialize(ConstAggregateDataPtr __restrict, WriteBuffer &, std::optional<size_t>) const override { fail(); }
@@ -90,6 +85,22 @@ struct WindowFunction : public IAggregateFunctionHelper<WindowFunction>, public
     void insertResultInto(AggregateDataPtr __restrict, IColumn &, Arena *) const override { fail(); }
 };
 
+struct StatelessWindowFunction : public WindowFunction
+{
+    StatelessWindowFunction(
+        const std::string & name_, const DataTypes & argument_types_, const Array & parameters_, const DataTypePtr & result_type_)
+        : WindowFunction(name_, argument_types_, parameters_, result_type_)
+    {
+    }
+
+    size_t sizeOfData() const override { return 0; }
+    size_t alignOfData() const override { return 1; }
+
+    void create(AggregateDataPtr __restrict) const override { }
+    void destroy(AggregateDataPtr __restrict) const noexcept override { }
+    bool hasTrivialDestructor() const override { return true; }
+};
+
 template <typename State>
 struct StatefulWindowFunction : public WindowFunction
 {
@@ -100,7 +111,7 @@ struct StatefulWindowFunction : public WindowFunction
     }
 
     size_t sizeOfData() const override { return sizeof(State); }
-    size_t alignOfData() const override { return 1; }
+    size_t alignOfData() const override { return alignof(State); }
 
     void create(AggregateDataPtr __restrict place) const override { new (place) State(); }
 
diff --git a/src/Processors/Transforms/WindowTransform.cpp b/src/Processors/Transforms/WindowTransform.cpp
index bd11aa4cd28..6ebe013f485 100644
--- a/src/Processors/Transforms/WindowTransform.cpp
+++ b/src/Processors/Transforms/WindowTransform.cpp
@@ -1500,11 +1500,10 @@ void WindowTransform::work()
     }
 }
 
-struct WindowFunctionRank final : public WindowFunction
+struct WindowFunctionRank final : public StatelessWindowFunction
 {
-    WindowFunctionRank(const std::string & name_,
-            const DataTypes & argument_types_, const Array & parameters_)
-        : WindowFunction(name_, argument_types_, parameters_, std::make_shared<DataTypeUInt64>())
+    WindowFunctionRank(const std::string & name_, const DataTypes & argument_types_, const Array & parameters_)
+        : StatelessWindowFunction(name_, argument_types_, parameters_, std::make_shared<DataTypeUInt64>())
     {}
 
     bool allocatesMemoryInArena() const override { return false; }
@@ -1519,11 +1518,10 @@ struct WindowFunctionRank final : public WindowFunction
     }
 };
 
-struct WindowFunctionDenseRank final : public WindowFunction
+struct WindowFunctionDenseRank final : public StatelessWindowFunction
 {
-    WindowFunctionDenseRank(const std::string & name_,
-            const DataTypes & argument_types_, const Array & parameters_)
-        : WindowFunction(name_, argument_types_, parameters_, std::make_shared<DataTypeUInt64>())
+    WindowFunctionDenseRank(const std::string & name_, const DataTypes & argument_types_, const Array & parameters_)
+        : StatelessWindowFunction(name_, argument_types_, parameters_, std::make_shared<DataTypeUInt64>())
     {}
 
     bool allocatesMemoryInArena() const override { return false; }
@@ -1721,7 +1719,7 @@ struct WindowFunctionExponentialTimeDecayedSum final : public StatefulWindowFunc
         const Float64 decay_length;
 };
 
-struct WindowFunctionExponentialTimeDecayedMax final : public WindowFunction
+struct WindowFunctionExponentialTimeDecayedMax final : public StatelessWindowFunction
 {
     static constexpr size_t ARGUMENT_VALUE = 0;
     static constexpr size_t ARGUMENT_TIME = 1;
@@ -1736,9 +1734,8 @@ struct WindowFunctionExponentialTimeDecayedMax final : public WindowFunction
         return applyVisitor(FieldVisitorConvertToNumber<Float64>(), parameters_[0]);
     }
 
-    WindowFunctionExponentialTimeDecayedMax(const std::string & name_,
-            const DataTypes & argument_types_, const Array & parameters_)
-        : WindowFunction(name_, argument_types_, parameters_, std::make_shared<DataTypeFloat64>())
+    WindowFunctionExponentialTimeDecayedMax(const std::string & name_, const DataTypes & argument_types_, const Array & parameters_)
+        : StatelessWindowFunction(name_, argument_types_, parameters_, std::make_shared<DataTypeFloat64>())
         , decay_length(getDecayLength(parameters_, name_))
     {
         if (argument_types.size() != 2)
@@ -1996,11 +1993,10 @@ struct WindowFunctionExponentialTimeDecayedAvg final : public StatefulWindowFunc
         const Float64 decay_length;
 };
 
-struct WindowFunctionRowNumber final : public WindowFunction
+struct WindowFunctionRowNumber final : public StatelessWindowFunction
 {
-    WindowFunctionRowNumber(const std::string & name_,
-            const DataTypes & argument_types_, const Array & parameters_)
-        : WindowFunction(name_, argument_types_, parameters_, std::make_shared<DataTypeUInt64>())
+    WindowFunctionRowNumber(const std::string & name_, const DataTypes & argument_types_, const Array & parameters_)
+        : StatelessWindowFunction(name_, argument_types_, parameters_, std::make_shared<DataTypeUInt64>())
     {}
 
     bool allocatesMemoryInArena() const override { return false; }
@@ -2278,13 +2274,12 @@ public:
 
 // ClickHouse-specific variant of lag/lead that respects the window frame.
 template <bool is_lead>
-struct WindowFunctionLagLeadInFrame final : public WindowFunction
+struct WindowFunctionLagLeadInFrame final : public StatelessWindowFunction
 {
     FunctionBasePtr func_cast = nullptr;
 
-    WindowFunctionLagLeadInFrame(const std::string & name_,
-            const DataTypes & argument_types_, const Array & parameters_)
-        : WindowFunction(name_, argument_types_, parameters_, createResultType(argument_types_, name_))
+    WindowFunctionLagLeadInFrame(const std::string & name_, const DataTypes & argument_types_, const Array & parameters_)
+        : StatelessWindowFunction(name_, argument_types_, parameters_, createResultType(argument_types_, name_))
     {
         if (!parameters.empty())
         {
@@ -2432,11 +2427,10 @@ struct WindowFunctionLagLeadInFrame final : public WindowFunction
     }
 };
 
-struct WindowFunctionNthValue final : public WindowFunction
+struct WindowFunctionNthValue final : public StatelessWindowFunction
 {
-    WindowFunctionNthValue(const std::string & name_,
-            const DataTypes & argument_types_, const Array & parameters_)
-        : WindowFunction(name_, argument_types_, parameters_, createResultType(name_, argument_types_))
+    WindowFunctionNthValue(const std::string & name_, const DataTypes & argument_types_, const Array & parameters_)
+        : StatelessWindowFunction(name_, argument_types_, parameters_, createResultType(name_, argument_types_))
     {
         if (!parameters.empty())
         {
diff --git a/tests/queries/0_stateless/03251_unaligned_window_function_state.reference b/tests/queries/0_stateless/03251_unaligned_window_function_state.reference
new file mode 100644
index 00000000000..e69de29bb2d
diff --git a/tests/queries/0_stateless/03251_unaligned_window_function_state.sql b/tests/queries/0_stateless/03251_unaligned_window_function_state.sql
new file mode 100644
index 00000000000..2ff75f61f76
--- /dev/null
+++ b/tests/queries/0_stateless/03251_unaligned_window_function_state.sql
@@ -0,0 +1,3 @@
+-- https://github.com/ClickHouse/ClickHouse/issues/70569
+-- Reproduces UBSAN alert about misaligned address
+SELECT anyLast(id), anyLast(time), exponentialTimeDecayedAvg(10)(id, time) FROM values('id Int8, time DateTime', (1,1),(1,2),(2,3),(3,3),(3,5)); -- { serverError BAD_ARGUMENTS }