They do seem to need sun.
All our trees/shrubs are in bloom right now.

Their bark reminds me of Madrona trees, which have a reddish/brownish peeling bark also.

you are further north

and maybe even further north, closer to DC. My neighbor, the landowner, thinks these may just need more sunlight.

My neighbor, who isn't here now, pointed in their direction yesterday and said there are some here (on his property,) that have not bloomed, so I looked at them more closely today.

Some bloom in the late spring to early summer and some bloom in late summer and early fall. Some have a relatively short blooming window of say 60 days or so while others may bloom for twice that long.

Which is a Japanese variety of crape myrtle as opposed to the more common lagerstroemia indica.

Lagerstroemia fauriei grows in the Southern zones, is more tree like, and generally doesn't bloom as abundantly as does lagerstroemia indica which is why the latter is often preferred in the US. As with all crape myrtles, it will bloom best if selectively pruned in the winter or spring and appropriately fertilized prior to blooming, which will probably be in the mid to late summer.

If these were mine I would prune them into one or two strong trunks and just enjoy them as a stately tree with an attractive trunk. Since they are mature, they may never bloom all that much.

http://hort.ifas.ufl.edu/database/documents/pdf/tree_fact_sheets/lagfaua.pdf

As they're not mine, belong to my landlord who owns many acres around here (and has a house in which he resides 2-3 days a week,) I won't be doing any pruning, but I may study this and let him know.

Here's a fauriei , from google chrome.

http://www.learn2grow.com/plantdatabase/plants/DisplayImage.ashx?ImageID=91518&width=560

Another:

Natchez is a hybrid between lagerstroemia faurei and lagerstroemia indica. That particular varital has been around for a very long time and is my favorite. I have two of them in my yard. One is about 30' tall or so and the other is not as big as I planted it just a couple of years back. Natchez always blooms white.

ravage the buds.

NO buds at all. Will look for evidence of beetles.

Told my neighbor, the landowner, that I like them a lot, he agrees, and as there's an old/sickish looking tree on the property, which he will remove, MAYBE we'll have blooming myrtle some year!