house building issues

[pvddinq]

USERNAME: pvddinq
APARTMENT COORDINATES (F3 TO VIEW): 1624 31 517
ISSUE: can't build in some places
ADDITIONAL INFORMATION:
Cords of spots I can't build in:

1629 32 521
1633 35 520
1633 35 525
1633 35 526
1633 35 528
1631 35 527
1618 35 526
1618 35 527
1618 35 528
1617 36 530
1617 36 531
1631 33 521
1630 33 522
1630 33 523
1621 33 523
1620 33 523
1619 33 522
1618 33 522
1618 33 520
1617 33 520
1618 33 535