Similar to LXC, LXD 2.x can also assign static IP addresses. Almost similar approach but the files are slightly different.
Also note as of LXD 2.3 there may be networking tools that take care of this. Not looking into 2.3 details yet as Ubuntu Server 16.04.2 LTS is packaged with 2.0.9.
Modify /etc/default/lxd-bridge to reference an external dnsmasq.conf,
sudo cp /etc/default/lxd-bridge /etc/default/lxd-bridge.ori sudo sed -i 's/LXD_CONFILE=""/LXD_CONFILE=""' /etc/default/lxd-bridge
Also, change the default DHCP range,
sudo sed -i 's/LXD_IPV4_DHCP_RANGE="10.232.27.2,10.232.27.254"/LXD_IPV4_DHCP_RANGE="10.232.27.100,10.232.27.254"' /etc/default/lxd-bridge sudo sed -i 's/LXD_IPV4_DHCP_MAX="252"/LXD_IPV4_DHCP_MAX="154"' /etc/default/lxd-bridge
This will make available 10.232.27.3 to 10.232.99.
Reference
http://jason.trickett.us/2016/08/lxd-containers-static-ip-addresses-heres/ - Source article for this but missing some details on changing the default range otherwise you'll end up with collisions.