A margin account allows 50% to be taken out of the account. Or 70% might be allowed for the purchase of real estate. Institutional margin rates can be found. Otherwise the assets just improve loan qualification and loan qualification is still needed.
The $100k on margin, at 50% margin, is without loan qualification and without a lien on the real estate. The $140k on margin, at 70% margin, might be putting a lien on the real estate but there is probably not much loan qualification.
Well, in standard brokerage accounts, "portfolio margin" is available with large account balances. Then "portfolio margin" can go up to very high margin percentages but "portfolio margin" is based on liquid positions held entirely in the account. To take value on margin out of a brokerage account, for the purpose of buying real-estate, then the 70% margin level is about the best deal that can be found. To take value on margin out of a brokerage account, just for general use, then the situation is back to the standard 50% margin level.