How to determine rebuild cost

[NA J.]

Are insurance agents plugging in tax assessors data to determine dwelling coverage. My rental is recorded as 3/2 built in 1923 but it's 2/2 and remodeled ~10 years ago.

It's basically identical to this house, same construction project and 'hood:
https://www.redfin.com/CA/Los-Angeles/1257-W-Exposition-Blvd-90007/home/6884856

Is that 800 sq ft? How much dwelling coverage should I have?

My house has the standard interior package (Average plumbing fixtures, no tile showers etc)

Does the carrier matter much? Safeco and Amica suggested 200k for $400/year. thx