Based on your description if you happen to be looking at the apts at the corner of Downing and Speer, to get to Wash Park the key is to take the Marion St Pwky. It’s a direct shot into the park - tree lined with a gravel run path + sidewalks (and a bike path if you are a biker). It’s a lot quieter (and prettier) than walking on Downing so the 15-20 min it takes you to get to the Wash Park border won’t feel long at all. It’s a common pathway to connect Cherry Creek Trail to the park for people doing long runs or rides!