You have to use your common sense in this. Everyone's situation is somewhat different.
First of all, only assets that make you money count.
Second, if you have to sell or rent an asset to make money off of it, and you are unwilling to do so, it does not count, either.
So, you can own a $25,000,000 home free and clear, but if you won't sell it and you won't rent it out and don't receive money for it for some other reason, it doesn't count.
If mom gave you a Picasso painting worth $20,000,000 but you won't sell it, it doesn't count.
Third, what matters in FIRE is reliable passive INCOME, not net worth.
That income shows up from different sources. Each source may have different characteristics and therefore, should be counted differently.
Example: A $10,000,000 property you will NEVER sell for sentimental reasons, that rents for $100 a month profit, is only worth $1200 a year towards your FIRE number.
Or, a $500,000 house you own free and clear, which will be sold at retirement and replaced with a cheaper house that leaves $300,000 in your pocket, that $300,000 counts towards your FIRE goals. But how does it contribute? That depends on what you invest it in. If you invest it in the stock market and intend to withdraw it at a 4% safe withdrawal rate (SWR), it can be counted on to provide $12,000 in income. If you invest it in a rental property that provides a $15,000 profit, it will count as $15,000 in income. Likewise, if that rental will only make $5,000 a year in profit, then it only counts as $5000.
You can't have a basket of investments with different characteristics, add up their sale value, divide by 25, and call it a day.
Let us know what kinds of income sources and investments you intend to have (or have now) and folks will be glad to help you figure out what % of the way towards FIRE you are.
Hope that helps!
FYI, if you replace that $500,000 house with a $600,000 house, it contributes nothing.