diff --git a/compiler/base/custom_layer_properties.py b/compiler/base/custom_layer_properties.py
new file mode 100644
index 00000000..f1d35e71
--- /dev/null
+++ b/compiler/base/custom_layer_properties.py
@@ -0,0 +1,161 @@
+# See LICENSE for licensing information.
+#
+# Copyright (c) 2016-2020 Regents of the University of California and The Board
+# of Regents for the Oklahoma Agricultural and Mechanical College
+# (acting for and on behalf of Oklahoma State University)
+# All rights reserved.
+#
+from design import design
+
+
+class _bank:
+    def __init__(self, stack, pitch):
+        # bank
+        # column address route: stack, pitch
+        # m1_stack, m2_pitch (default)
+        # m2_stack, m3_pitch (sky130)
+        self.stack = stack
+        self.pitch = pitch
+    
+
+class _hierarchical_decoder:
+    def __init__(self,
+                 bus_layer,
+                 bus_directions,
+                 bus_pitch,
+                 bus_space,
+                 input_layer,
+                 output_layer,
+                 output_layer_pitch,
+                 vertical_supply):
+        # hierarchical_decoder
+        # bus_layer, bus_directions, bus_pitch, bus_space, input_layer, output_layer, output_layer_pitch
+        # m2, pref, m2_pitch, m2_space, m1, m3, m3_pitch
+        # m1, nonpref, m1_pitch, m2_space, m2, li, li_pitch (sky130)
+        # 
+        # vertical vdd/gnd
+        # special jog
+
+        # hierarchical_predecode
+        # bus_layer, bus_directions, bus_pitch, bus_space, input_layer, output_layer, output_layer_pitch
+        # m2, pref, m2_pitch, m2_space, m1, m1, m1_pitch
+        # m1, nonpref, m1_pitch, 1`.5*m1_space, m2, li, li_pitch (sky130)
+        #
+        # vertical vdd/gnd
+        # special jogging
+        self.bus_layer = bus_layer
+        self.bus_directinos = bus_directions
+        self.bus_pitch = bus_pitch
+        self.bus_sapce = bus_space
+        self.input_layer = input_layer
+        self.output_layer = output_layer
+        self.vertical_supply = vertical_supply
+
+        
+class _column_mux_array:
+    def __init__(self,
+                 select_layer,
+                 select_pitch,
+                 bitline_layer):
+        # column_mux_array
+        # sel_layer, sel_pitch, bitline_layer
+        # m1, m2_pitch, m2
+        # m3, m3_pitch, m1 (sky130)
+        self.select_layer = select_layer
+        self.select_pitch= select_pitch
+        self.bitline_layer = bitline_layer
+
+        
+class _port_address:
+    def __init__(self,
+                 supply_offset):
+        # port_adress
+        # special supply offset
+        self.supply_offset = supply_offset
+
+        
+class _port_data:
+    def __init__(self,
+                 enable_layer):
+        # port_data
+        # connect bitlines instead of chanel route
+
+        # sense_amp_array
+        # en_layer
+        # m1
+        # m3 (sky130)
+    
+        # precharge_array
+        # en_bar_layer
+        # m1
+        # m3 (sky130)
+        self.enable_layer = enable_layer
+
+
+class _replica_column:
+    def __init__(self,
+                 even_rows):
+        # replica_column
+        # even row check (sky130)
+        self.even_rows = even_rows
+        
+        
+class _wordline_buffer_array:
+    def __init__(self,
+                 vertical_supply):
+        # wordline_buffer_array
+        # vertical vdd/gnd (sky130)
+        self.vertical_supply = vertical_supply
+
+
+class _wordline_driver_array:
+    def __init__(self,
+                 vertical_supply):
+        # wordline_driver_array
+        # vertical vdd/gnd (sky130)
+        self.vertical_supply = vertical_supply
+        
+        
+class layer_properties():
+    """
+    This contains meta information about the module routing layers. These
+    can be overriden in the tech.py file.
+    """
+    def __init__(self):
+        self.names = {}
+
+        self._bank = _bank(stack=design.m1_stack,
+                           pitch=design.m2_pitch)
+
+    @property
+    def bank(self):
+        return self._bank
+                 
+    @property
+    def column_mux_array(self):
+        return self._column_mux_array
+
+    @property
+    def hierarchical_decoder(self):
+        return self._hierarcical_decoder
+
+    @property
+    def port_address(self):
+        return self._port_address
+
+    @property
+    def port_data(self):
+        return self._port_data
+
+    @property
+    def replica_column(self):
+        return self._replica_column
+
+    @property
+    def wordline_buffer_array(self):
+        return self._wordline_buffer_array
+
+    @property
+    def wordline_driver_array(self):
+        return self._wordline_driver_array
+