By a covenant, executed and duly recorded by the owner of record,
running with the land, whereby such ways and services shall be provided
to serve any lot before such lot may be built upon or conveyed, other
than by mortgage deed; provided, that a mortgagee who acquires title
to the mortgage premises by foreclosure or otherwise and succeeding
owner of such premises or part thereof may sell any such lot, subject
to that portion of the covenant which provides that no such lot shall
be built upon until such ways and services have been provided to serve
such lot; and provided, further, that nothing herein shall be deemed
to prohibit a conveyance by a single deed, subject to such a covenant,
of either the entire parcel of land shown on the subdivision plan
or of all lots not previously released by the Planning Board. A deed
of any part of the subdivision in violation hereof shall be voidable
by the grantee prior to the release of the covenant but not later
than three years from the date of such deed.