It depends on the area. Both Texas and New Jersey have very high property taxes, so it wouldn't be that surprising. Or it could be expected insurance costs like in Florida, which could be very high.

I've seen condos where the Strata/HOA fee alone would have been around 25% of the monthly mortgage.

$400 / month strata on a $1600 / month condo. It's practically thievery, no idea how maintaining and apartment is supposed to cost $4800 a year per person. Can't remember how many unit but even assuming a low count of 10 units that's $48,000 a year in maintenance. Seems pretty excessive.

Curious where you are getting 25%?

At least this amount will, assuming it's just taxes and insurance, be due every month for as long as it's owned. Property taxes in California for example are around 1%/year (so a $377k home would be around $4k/year).

If you own the home outright you may not need insurance, but of course, that's a risk.

Taxes may be severely limited in how much they increase (see: California prop 13), so while they will likely increase it may not match e.g. rental increases.