diff --git a/domain/bulk_document_download/__init__.py b/domain/bulk_document_download/__init__.py
new file mode 100644
index 000000000..e69de29bb
diff --git a/domain/bulk_document_download/package_plan.py b/domain/bulk_document_download/package_plan.py
new file mode 100644
index 000000000..6d08f6171
--- /dev/null
+++ b/domain/bulk_document_download/package_plan.py
@@ -0,0 +1,66 @@
+"""The Download Package plan (ADR-0060).
+
+Pure logic: given the documents resolved for a set of properties, decide what
+goes where in the ZIP — one folder per property, the latest file of each
+Document Type — and which rows are skipped and reported. No I/O: the
+orchestrator does the S3/DB work; this module only lays out the archive.
+"""
+
+from __future__ import annotations
+
+from dataclasses import dataclass
+from datetime import datetime
+from typing import Optional, Sequence
+
+
+@dataclass(frozen=True)
+class ResolvedDocument:
+    """One `uploaded_files` row resolved for packaging: its property identity
+    (matched by `landlord_property_id`, ADR-0060), the display address enriched
+    from the hubspot deals data, its Document Type (`file_type`, nullable), the
+    S3 location to read it from, and when it was uploaded (for latest-per-type).
+    """
+
+    landlord_property_id: str
+    address: str
+    document_type: Optional[str]
+    s3_bucket: str
+    s3_key: str
+    uploaded_at: datetime
+
+
+@dataclass(frozen=True)
+class PackageEntry:
+    """One file to place in the Download Package: where it lands in the ZIP and
+    the S3 object to stream in from."""
+
+    zip_path: str
+    s3_bucket: str
+    s3_key: str
+
+
+@dataclass(frozen=True)
+class SkippedDocument:
+    """A resolved row left out of the package, with the reason (surfaced in the
+    run's `sub_task.outputs`, ADR-0060)."""
+
+    landlord_property_id: str
+    s3_key: str
+    reason: str
+
+
+@dataclass(frozen=True)
+class DownloadPackagePlan:
+    """The laid-out archive: the files to include and the rows skipped."""
+
+    entries: tuple[PackageEntry, ...]
+    skipped: tuple[SkippedDocument, ...]
+
+
+def plan_download_package(
+    documents: Sequence[ResolvedDocument],
+) -> DownloadPackagePlan:
+    """Lay out a Download Package from resolved documents (ADR-0060): one folder
+    per property, the latest file of each Document Type, null-Document-Type rows
+    skipped and reported."""
+    raise NotImplementedError
diff --git a/tests/domain/bulk_document_download/__init__.py b/tests/domain/bulk_document_download/__init__.py
new file mode 100644
index 000000000..e69de29bb
diff --git a/tests/domain/bulk_document_download/test_package_plan.py b/tests/domain/bulk_document_download/test_package_plan.py
new file mode 100644
index 000000000..2271aefd0
--- /dev/null
+++ b/tests/domain/bulk_document_download/test_package_plan.py
@@ -0,0 +1,48 @@
+"""The Download Package plan (ADR-0060) — pure layout of the ZIP from resolved
+documents: one folder per property, latest file of each Document Type,
+null-Document-Type rows skipped and reported."""
+
+from datetime import datetime, timezone
+
+from domain.bulk_document_download.package_plan import (
+    ResolvedDocument,
+    plan_download_package,
+)
+
+
+def _doc(
+    *,
+    landlord_property_id: str = "LP1",
+    address: str = "12 Oak Street",
+    document_type: str = "site_note",
+    s3_key: str = "a.pdf",
+    uploaded_at: datetime = datetime(2026, 1, 1, tzinfo=timezone.utc),
+) -> ResolvedDocument:
+    return ResolvedDocument(
+        landlord_property_id=landlord_property_id,
+        address=address,
+        document_type=document_type,
+        s3_bucket="src-bucket",
+        s3_key=s3_key,
+        uploaded_at=uploaded_at,
+    )
+
+
+def test_keeps_only_the_latest_file_of_a_document_type_in_the_property_folder() -> None:
+    # Arrange — two site_note files for the same property, uploaded at
+    # different times; only the newest should be packaged.
+    older = _doc(
+        s3_key="old.pdf", uploaded_at=datetime(2026, 1, 1, tzinfo=timezone.utc)
+    )
+    newer = _doc(
+        s3_key="new.pdf", uploaded_at=datetime(2026, 6, 1, tzinfo=timezone.utc)
+    )
+
+    # Act
+    plan = plan_download_package([older, newer])
+
+    # Assert — one entry, the newer file, foldered under the property.
+    assert len(plan.entries) == 1
+    entry = plan.entries[0]
+    assert entry.s3_key == "new.pdf"
+    assert entry.zip_path.startswith("12 Oak Street (LP1)/")