Since this 450k and 300k is your second purchase, you need to find experienced agent/lawyer to assist you through.

bcoz there is regulation on some bank that imposed on the restrictions.

otherwise they will parr down on your 3rd purchase, e.g. 300k property and you wil to fork out 30% downpayment (90k)

if everything go smoothly will get your 450k and 300k with 90% Margin of finance.

your 1st property have increase in valuation? it is no point if you do the refinance if the value of property is not increased.

yes this is loan multiple submission aka compression

depend on which bank