diff --git a/routes/api/update/lease_accept.ts b/routes/api/update/lease_accept.ts
new file mode 100644
index 0000000..c366d18
--- /dev/null
+++ b/routes/api/update/lease_accept.ts
@@ -0,0 +1,50 @@
+// routes/api/update/lease_accept.ts
+import { define } from "../../../utils.ts";
+import { signLease } from "../../../services/leaseService.ts";
+import { SessionCookie } from "../../auth/callback.ts";
+
+export const handler = define.handlers({
+  async POST(ctx) {
+    try {
+      const stateData: SessionCookie = ctx.state.data;
+      const { user_id } = stateData || {};
+
+      if (!user_id) {
+        return new Response(JSON.stringify({ error: "Unauthorized" }), {
+          status: 401,
+          headers: { "Content-Type": "application/json" },
+        });
+      }
+
+      const contentType = ctx.req.headers.get("content-type") || "";
+      let data: Record<string, unknown> = {};
+      if (contentType.includes("application/json")) {
+        data = await ctx.req.json();
+      } else {
+        const form = await ctx.req.formData();
+        for (const [k, v] of form.entries()) {
+          data[k] = typeof v === "string" ? v : String(v);
+        }
+      }
+
+      const lease_id = (data.lease_id as string) || (data["lease_id"] as string);
+      if (!lease_id) {
+        return new Response(JSON.stringify({ error: "lease_id is required" }), {
+          status: 400,
+          headers: { "Content-Type": "application/json" },
+        });
+      }
+
+      const result = await signLease(lease_id, user_id as string);
+      return new Response(JSON.stringify({ success: true, lease: result?.[0] || null }), {
+        status: 200,
+        headers: { "Content-Type": "application/json" },
+      });
+    } catch (err) {
+      return new Response(JSON.stringify({ error: String(err) }), {
+        status: 500,
+        headers: { "Content-Type": "application/json" },
+      });
+    }
+  },
+});