What is *wrong* with this query???

I give! I'm flummoxed!

Here is what I have, 3 tables:

schedule
company building status0
3 x active
4 x active
5 x active
3 x active
3 x active
3 x active

In the end, I want to replace the building id's above. They start out with the non-informative value of '1';

company
id name status
3 x active
4 y active
5 z active

building
id company name
1 3 A active
2 3 B active
3 3 C active
4 4 D active
5 4 E active
6 4 F active
7 5 G active
8 5 H active
9 5 I active

So, every company has 3 schedules. Of the 3, I'd like to select the one with the lowest id.

I'm using postgresql 8.1. Yes, ancient, but I have no choice in this affair.

select schedule.id as sched_id, bld.id as bid
from
schedule
left join company on schedule.company = company.id
left join (select * from building where building.company = company.id order by id limit 1) as bld
where
schedule.status = 'active' and company.status = 'active' and bld.status = 'active';

I get a syntax error on the the "where".

ERROR: syntax error at or near "where" at character ….
LINE 6: where
^

If I leave out the where clause entirely, that's an error also,
ERROR: syntax error at or near ";" at character ….
LINE 5: … as bld ;
^ <it's right under the semicolon>

So, it's expecting ***SOMETHING*** after the "as bld", but it sure isn't going to tell me what.
What am I missing?