Great question — answering as the UphillTech team:
I think your estimates are a little off; those were plausible homes for those characters at that time. I live in the DC area and have purchased two homes here in the last 20 years. From what I know of the location of their house (Falls Church, according to the show), the rough size of the house apparent from the interior shots, and the small very yard and structural connection to their neighbor as seen in exterior shots, I would say $1 million in today's dollars is off the mark. A 3 BR house like that in Falls Church would probably run you in the $700,000-750,000 range in 2020. Here is a link to a similar attached home with garage and 3 BR for $725,000. My impression of Beeman's home is...
Full answer by ruffdove: https://movies.stackexchange.com/a/112024 (CC BY-SA 3.0).
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