Ok;
You have 250k capital, rising in value at, say 10% p.a. (in current climate).
This equates to 25k per annum.
If you leverage up to 500k at, say 5% interest rate, you now yield 37.5k from your capital.
If the market continues to rise.......
Make your own decision, but if you decide to go, you'ld be advised to give the deeds only on property 1, with rental income, leaving you with the deeds of no. 2 in hand, should current trends continue and you see something else to purchase in a year or two.