diff --git a/Cargo.lock b/Cargo.lock
index 4e85aa8..53d29f8 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -1148,7 +1148,7 @@ checksum = "11d3d7f243d5c5a8b9bb5d6dd2b1602c0cb0b9db1621bafc7ed66e35ff9fe092"
 
 [[package]]
 name = "lofty-cli"
-version = "0.1.6"
+version = "0.1.7"
 dependencies = [
  "assert_cmd",
  "clap",
diff --git a/Cargo.toml b/Cargo.toml
index df4e4d4..8bbb544 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -1,6 +1,6 @@
 [package]
 name = "lofty-cli"
-version = "0.1.6"
+version = "0.1.7"
 edition = "2021"
 rust-version = "1.88"
 description = "Interact with the Lofty (lofty.ai) fractional real-estate marketplace API — market data, order books, and market-making analysis. Keychain-secured, agent-friendly."
diff --git a/src/commands/properties.rs b/src/commands/properties.rs
index d82dae2..c013281 100644
--- a/src/commands/properties.rs
+++ b/src/commands/properties.rs
@@ -17,9 +17,12 @@ pub enum Cmd {
         /// Items per page (max 200).
         #[arg(long, default_value_t = 50)]
         page_size: u32,
-        /// RESIDENTIAL, COMMERCIAL, or ALL.
-        #[arg(long, default_value = "ALL")]
-        property_type: String,
+        /// Filter by property type. Values are upstream-defined and passed
+        /// through verbatim (observed: "single family", "vacation rental",
+        /// "duplex", "triplex", "fourplex", "mixed use", "commercial").
+        /// Omit to list every type.
+        #[arg(long)]
+        property_type: Option<String>,
         /// Location filter (default all).
         #[arg(long)]
         location: Option<String>,
@@ -32,6 +35,30 @@ pub enum Cmd {
     Trades { property_id: String },
 }
 
+/// Query for the marketplace listing. `propertyType` is omitted entirely when
+/// no filter is given: the upstream enum changed out from under the old `ALL`
+/// sentinel (every documented value now 400s with `invalid_property_type`),
+/// and omission already means "all types". A user-supplied value is passed
+/// through verbatim so new upstream values work without a CLI release.
+fn list_query(
+    page: u32,
+    page_size: u32,
+    property_type: Option<&str>,
+    location: Option<&str>,
+) -> Vec<(&'static str, String)> {
+    let mut q = vec![
+        ("page", page.to_string()),
+        ("pageSize", page_size.to_string()),
+    ];
+    if let Some(pt) = property_type {
+        q.push(("propertyType", pt.to_string()));
+    }
+    if let Some(loc) = location {
+        q.push(("location", loc.to_string()));
+    }
+    q
+}
+
 pub fn run(ctx: &Ctx, cmd: &Cmd) -> Result<(), CliError> {
     let client = ctx.client()?;
     match cmd {
@@ -41,14 +68,12 @@ pub fn run(ctx: &Ctx, cmd: &Cmd) -> Result<(), CliError> {
             property_type,
             location,
         } => {
-            let mut q = vec![
-                ("page", page.to_string()),
-                ("pageSize", page_size.to_string()),
-                ("propertyType", property_type.clone()),
-            ];
-            if let Some(loc) = location {
-                q.push(("location", loc.clone()));
-            }
+            let q = list_query(
+                *page,
+                *page_size,
+                property_type.as_deref(),
+                location.as_deref(),
+            );
             let payload = client.get("/public/v1/properties", &q)?;
             emit(ctx, "properties-list", payload, |v| {
                 let props = v
@@ -122,3 +147,36 @@ pub fn run(ctx: &Ctx, cmd: &Cmd) -> Result<(), CliError> {
         }
     }
 }
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn omits_property_type_when_no_filter_is_given() {
+        // Sending any sentinel (the old default was `ALL`) now 400s upstream;
+        // "all types" must be expressed by leaving the parameter off.
+        let q = list_query(1, 50, None, None);
+        assert_eq!(
+            q,
+            vec![("page", "1".to_string()), ("pageSize", "50".to_string())]
+        );
+    }
+
+    #[test]
+    fn passes_a_property_type_through_verbatim() {
+        // Upstream values contain spaces and are lowercase ("vacation rental");
+        // no client-side casing, mapping, or validation — unknown-to-us values
+        // must reach the API untouched so new upstream types just work.
+        let q = list_query(2, 10, Some("vacation rental"), Some("Tiffin, OH"));
+        assert_eq!(
+            q,
+            vec![
+                ("page", "2".to_string()),
+                ("pageSize", "10".to_string()),
+                ("propertyType", "vacation rental".to_string()),
+                ("location", "Tiffin, OH".to_string()),
+            ]
+        );
+    }
+}