function isWhitelisted(address _user) public constant returns (bool);
}

contract PropTokenRENT is Ownable {
    using SafeMath for uint256;

    Blocksquare BST;
    Data data;
    Whitelist whitelist;
    mapping(address => mapping(address => uint256)) rentAmountPerToken;

    constructor() public {
        BST = Blocksquare(0x509A38b7a1cC0dcd83Aa9d06214663D9eC7c7F4a);
        data = Data(0x146d589cfe136644bdF4f1958452B5a4Bb9c5A05);
        whitelist = Whitelist(0xCB641F6B46e1f2970dB003C19515018D0338550a);
    }