IMO 70 is way too high to set your heat unless you want to pay $$$. See if you can get a nest thermostat or other energy saving thermostat installed. It has saved me money, as I’ve been able to keep my energy costs the same despite the increase in the cost of natural gas. Ask your landlord to look into the rebates BGE has on smart thermostats as you can get great deals on the BGE website. Still, your bill seems way high. I wonder if your insulation sucks.

I have a two story row home, 1300 square feet, keep my heat between 61-65 depending on the time of day (my smart thermostat automatically adjusts). My last BGE bill was $56 gas, $100 electric (which is high for me, but we had that cold snap)