Perform insert for each row taken from a select?

I have a number of records that I need to insert into multiple tables. Every other column will be a constant.

Poor pseudo code below - this is what I want to do:

create table #temp_buildings
(
    building_id varchar(20)
)
insert into #temp_buildings (building_id) VALUES ('11070')
insert into #temp_buildings (building_id) VALUES ('11071')
insert into #temp_buildings (building_id) VALUES ('20570')
insert into #temp_buildings (building_id) VALUES ('21570')
insert into #temp_buildings (building_id) VALUES ('22570')

insert into property.portfolio_property_xref
        ( portfolio_id ,
          building_id ,
          created_date ,
          last_modified_date
        )
values
        ( 
            34 ,
            (
                select  building_id
                from    #temp_buildings
            ) ,
            getdate() ,
            null
        )

Intent: Perform an insert into property.portfolio_property_xref for each record on #temp_buildings

I think I could do this with a cursor - but believe this would be horribly slow. As this exercise will be repeatable in future I'd rather tackle this in a faster method but I'm unsure how. Any feedback would be appreciated!