need help to approach a multibuilding network

[BrandonCuellar]

what is the best way to approach the design below:

2 separate building network, each utilizing MS-425 distribution switch stack, but both connect to the same MX warm spare. Current design. Each distribution switch is serving dhcp. Goal is to have both networks talking to one another via the MX serving which is kind of as the core. 

I have a static route on from each distribution switch (Separate VLAN)to the MX. 

then static routes for each subnet from MX to the respective building. What is the best approach to get building 1 to talk to building 2, and vice versa? 

[Reza Sharifi]

Looking at your design, it appears that the central point where you can connect the buildings together is the core switches at the top.

So, if all the other switches all just layer-2, you can just configure the SVI for each vlan on the 2 core switches and then route between them and the switches/routers sitting above them. If the switches, below the core switches, are layer-3 that you just need /30 between them at the core (or vlan with SVIs) and then route the VLANs again at the core. either way, the central point to connect them together is the core switches.

HTH