If your investment basis is your cash outlay you make to acquire the property, then you should only count the value of the house minus the value of the mortgage as an asset on your balance sheet. Chances are, you will count the whole value of the house as an asset on your balance sheet and the mortgage as a liability so your basis in the house is the total value of the property plus the interest you pay over the lifetime of the mortgage - this is greater than the total value of the property. The rent expense on an identical property is offset by commuted rent income due to occupying the property instead of renting it out.
If the interest rate on the mortgage is equal to inflation, then you will realize the same gains on the house as if you put the downpayment in an interest bearing account at that same interest rate. This is before accounting for transaction costs, property taxes, upkeep, etc. If the mortgage rate is lower than inflation then you will have a larger gain and if the mortgage rate is higher than inflation then you will lose money.
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The increase in earnings will be largest when you have 0 years of work experience and smallest when you have 40 years of work experience. In this sense, the value of the degree diminishes over time as the value of your work experience increases.
Alternatively, you can do a discounted cash flow analysis on this increase in lifetime earnings to get the present value of the degree - you could do this while still in school, at graduation or partway through your career. Arguably, if you do this analysis partway through your career, you should include the increases in earnings already realized in which case the value of the degree will likely remain static or drop slightly over time. Regardless, the value of the degree will not go up over time.
The value of the actual education itself to a career is usually lower than the value of a random (as in random access) sample of 4 years of work experience. However, the value of the education & degree to getting the first, second, and perhaps even third job is non-negligible.