diff --git a/litellm/llms/vertex_ai/vertex_llm_base.py b/litellm/llms/vertex_ai/vertex_llm_base.py
index 8f3037c791..f367ee6ad5 100644
--- a/litellm/llms/vertex_ai/vertex_llm_base.py
+++ b/litellm/llms/vertex_ai/vertex_llm_base.py
@@ -24,15 +24,10 @@ else:
 class VertexBase:
     def __init__(self) -> None:
         super().__init__()
-        self.access_token: Optional[str] = None
-        self.refresh_token: Optional[str] = None
-        self._credentials: Optional[GoogleCredentialsObject] = None
         self._credentials_project_mapping: Dict[
             Tuple[Optional[VERTEX_CREDENTIALS_TYPES], Optional[str]],
             GoogleCredentialsObject,
         ] = {}
-        self.project_id: Optional[str] = None
-        self.async_handler: Optional[AsyncHTTPHandler] = None
 
     def get_vertex_region(self, vertex_region: Optional[str]) -> str:
         return vertex_region or "us-central1"
@@ -261,7 +256,7 @@ class VertexBase:
             json.dumps(credentials) if isinstance(credentials, dict) else credentials
         )
         credential_cache_key = (cache_credentials, project_id)
-        _credentials: Optional[GoogleCredentialsObject] = None
+        cached_credentials: Optional[GoogleCredentialsObject] = None
 
         verbose_logger.debug(
             f"Checking cached credentials for project_id: {project_id}"
@@ -271,10 +266,10 @@ class VertexBase:
             verbose_logger.debug(
                 f"Cached credentials found for project_id: {project_id}."
             )
-            _credentials = self._credentials_project_mapping[credential_cache_key]
+            cached_credentials = self._credentials_project_mapping[credential_cache_key]
             verbose_logger.debug("Using cached credentials")
-            credential_project_id = _credentials.quota_project_id or getattr(
-                _credentials, "project_id", None
+            credential_project_id = cached_credentials.quota_project_id or getattr(
+                cached_credentials, "project_id", None
             )
 
         else:
@@ -283,7 +278,7 @@ class VertexBase:
             )
 
             try:
-                _credentials, credential_project_id = self.load_auth(
+                cached_credentials, credential_project_id = self.load_auth(
                     credentials=credentials, project_id=project_id
                 )
             except Exception as e:
@@ -292,14 +287,14 @@ class VertexBase:
                 )
                 raise e
 
-            if _credentials is None:
+            if cached_credentials is None:
                 raise ValueError(
                     "Could not resolve credentials - either dynamically or from environment, for project_id: {}".format(
                         project_id
                     )
                 )
 
-            self._credentials_project_mapping[credential_cache_key] = _credentials
+            self._credentials_project_mapping[credential_cache_key] = cached_credentials
 
         ## VALIDATE CREDENTIALS
         verbose_logger.debug(f"Validating credentials for project_id: {project_id}")
@@ -310,7 +305,7 @@ class VertexBase:
         ):
             raise ValueError(
                 "Could not resolve project_id. Credential project_id: {} does not match requested project_id: {}".format(
-                    _credentials.quota_project_id, project_id
+                    cached_credentials.quota_project_id, project_id
                 )
             )
         elif (
@@ -320,21 +315,21 @@ class VertexBase:
         ):
             project_id = credential_project_id
 
-        if _credentials.expired:
-            self.refresh_auth(_credentials)
+        if cached_credentials.expired:
+            self.refresh_auth(cached_credentials)
 
         ## VALIDATION STEP
-        if _credentials.token is None or not isinstance(_credentials.token, str):
+        if cached_credentials.token is None or not isinstance(cached_credentials.token, str):
             raise ValueError(
                 "Could not resolve credentials token. Got None or non-string token - {}".format(
-                    _credentials.token
+                    cached_credentials.token
                 )
             )
 
         if project_id is None:
             raise ValueError("Could not resolve project_id")
 
-        return _credentials.token, project_id
+        return cached_credentials.token, project_id
 
     async def _ensure_access_token_async(
         self,