diff --git a/bootstrap.py b/bootstrap.py
index 8316955..b43df96 100644
--- a/bootstrap.py
+++ b/bootstrap.py
@@ -23,11 +23,13 @@ from hub_api.workflow.insel_montly_energy_balance import InselMonthlyEnergyBalan
 from hub_api.workflow.costs import Costs
 from hub_api.workflow.energy_plus import EnergyPlus
 from hub_api.energy_plus.idf_generator import IdfGenerator
+from hub_api.config import Config
 
 
 sh.begin_time = datetime.datetime.now()
 app = flask.Flask('cerc_api')
 app.json_provider_class = LazyJSONEncoder
+app.config['MAX_CONTENT_LENGTH'] = Config.max_file_size
 api = Api(app)
 
 api.add_resource(Uptime, '/v1.4/uptime')
diff --git a/hub_api/config.py b/hub_api/config.py
index a61fcd2..33c1ac7 100644
--- a/hub_api/config.py
+++ b/hub_api/config.py
@@ -21,6 +21,7 @@ class Config:
 
     environment = 'PROD'
     database_name = 'montreal_retrofit'
+    self._max_file_size = 10 * 1024 * 1024  # 10 MB
 
     self._database = DBControl(db_name=database_name, app_env=environment, dotenv_path=dotenv_path)
     self._repository = Repository(db_name=database_name, app_env=environment, dotenv_path=dotenv_path)
@@ -37,3 +38,7 @@ class Config:
   @property
   def energy_systems_catalog(self):
     return self._energy_systems_catalog
+
+  @property
+  def max_file_size(self):
+    return self._max_file_size
diff --git a/hub_api/workflow/insel_montly_energy_balance.py b/hub_api/workflow/insel_montly_energy_balance.py
index c7564c4..8a49af1 100644
--- a/hub_api/workflow/insel_montly_energy_balance.py
+++ b/hub_api/workflow/insel_montly_energy_balance.py
@@ -1,14 +1,36 @@
+import json
+from pathlib import Path
 from flask_restful import Resource
+from flask import Response, request
 
 from hub_api.config import Config
+from hub_api.helpers.session_helper import refresh_session
 
 
 class InselMonthlyEnergyBalance(Resource, Config):
   def __init__(self):
     super().__init__()
+    self._extensions = ['geojson', 'citygml']
+
+  def _allowed_extensions(self, filename):
+    self._file_extension = Path(filename).suffix
+    return self._file_extension in self._extensions
+
+  def _geojson(self, geojson_file):
+    return
 
   def post(self):
     """
     API call for performing the monthly energy balance workflow
     """
-    raise NotImplementedError()
+    session_id = request.headers.get('session-id', None)
+    token = request.headers.get('token', None)
+    application_uuid = request.headers.get('application-uuid', None)
+    _session = refresh_session(session_id, token, application_uuid)
+    if _session is None:
+      return Response(json.dumps({'error': 'unauthorized'}), status=403)
+    else:
+      geometry_file = request.files['geometry_file']
+      if not self._allowed_extensions(geometry_file):
+        return Response(json.dumps({'error': 'Unsupported media type'}), status=415, headers=token)
+